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How to resolve Azure “Windows logins are not supported in this version of SQL Server”?

right now I am working on a project with .Net CORE c# and entity framework database and I get an error
SqlException: Windows logins are not supported in this version of SQL
Server.
I followed a tutorial and I think I did everything fine...
The only difference is that I have my database hosted on Azure, it should matters?
Here is my connection string
"DefaultConnection": "Server=firstdb123.database.windows.net;Database=TestDB;Trusted_Connection=True;MultipleActiveResultSets=true",
Here is a picture with my database
I have my EmployeesController and my EmployeeContext made by visual studio so it should be right.. but I don't know why it dose not work
Any help would be awesome

See that Trusted_Connection=True; bit in your your connection string? That's a Windows shortcut that allows you to bypass the normal username/password credentials on a server.
You need to create secure Azure login, then use that to specify the connection string.
This page shows how a connection string is created in the various different SQL version.

You can connect to the Azure SQL using the Active Directory Integrated authentication as it is documented.
Connection string should be like
connectionString="Server=servername.database.windows.net,1433;Initial Catalog=DatabaseName;Authentication='Active Directory Integrated'"

Windows Logins of SQL Server:
When a user connects through a Windows user account, SQL Server validates the account name and password using the Windows principal token in the operating system. AS your SQL Database is hosted in azure, we must ensure that your SQL Database and your .Net Core Application are in same Domain when use Windows Logins to connect to SQL Server.
More information about Windows Authentication, we can refer to: Connecting Through Windows Authentication
To Solve your problem, we can use SQL Server Authentication by pass the user name and password.
We can set the User Name and Password at portal as below:
And we can get connection String at portal as below:
Then we can use this connection string in Entity Framework or ADO.NET code.

It does matter that the database is hosted on Azure, because Azure doesn't have access to your windows account and can't verify that you are logged in with a windows account.
You could use the Server admin, but that is not very secure when you are going to run things in production.
Members of the sysadmin fixed server role can perform any activity in the server.
https://learn.microsoft.com/en-us/sql/relational-databases/security/authentication-access/server-level-roles?view=sql-server-2017
To solve this you could create a database user by using:
CREATE USER [{username}] WITH PASSWORD=N'{password}'
Execute this on the database you need access to.
After creating the user you have to give it some permissions:
EXEC sp_addrolemember 'db_datareader', [{username}];
'db_datareader' gives the user read-only permissions on the database. Maybe this is not enough for your user, then you van give it some more permissions by executing the statement again with another database role. More about the database roles: https://learn.microsoft.com/en-us/sql/relational-databases/security/authentication-access/database-level-roles?view=sql-server-2017
For Azure SQL databases it is not possible to do this via SQL Server Management Studio. More information about this:
https://learn.microsoft.com/en-us/azure/sql-database/sql-database-manage-logins
https://www.mssqltips.com/sqlservertip/5242/adding-users-to-azure-sql-databases/
Use this user in your connection string:
"DefaultConnection": "Server=firstdb123.database.windows.net;Database=TestDB;User Id={username};Password={password};MultipleActiveResultSets=true"
I hope this helps you.

SQL Connection Using Domain Username And Password

I have developed an ASP.Net website. The problem I am facing is when I run the application in IIS on my system using the connection string in web.config ("Data Source=.\;Initial Catalog=ITS;Integrated Security=True") it works well. I connects to the database and displays the data.
I have installed the database on a domain computer with the ASP.NET package in IIS. The problem here is it doesn't connects to the database. I have tried to use the connection string like this "Data Source=.\;Initial Catalog=ITS;UID=S1\ISLWW74562S;PWD=delta$%67;Integrated Security=True"
Where S1 is the domain name and ISLWW74562S is the username.
It gives an error cannot find the login S1\ISLWW74562S$
Can anyone help me how and what is the proper way to use the connection string on a domain computer.
Thanks

Remove the UID=S1\ISLWW74562S;PWD=delta$%67 from the connection string, and instead in IIS, create a special application pool for your web site and configure such application pool to run under the domain account.
Take a look at this to see how to setup the application pool to use a custom account.
Also, make sure that the domain account that you are using has the required access to the SQL database that you want to use.
If you are using Microsoft SQL server, then you need to use SQL management studio to create a new login for the domain user and give it the appropriate access to the database that you are using.

When you use Integrated Security, you don't get to specify the username and password. Sql Server will not allow you to do this. Instead, it's looking for a token that was issued by the domain controller, and that's all it will accept.
You can get a token like this for your application by using the Impersonation feature in IIS or by setting up the application pool for IIS to run as that user account.

Cannot open database in windows service

I am trying to connect my window service to my local db.
In my OnStart() method inside Service.cs class, i am getting this error..
The underlying provider failed on Open.System.Data.SqlClient.SqlException
(0x80131904): Cannot open database "EduFameProjectDB18" requested by the login.
The login failed.
Login failed for user 'NT AUTHORITY\SYSTEM'.

You are trying to use the SYSTEM account in order to access your database. This is due to the fact that you are using integrated authentication in SQL Server and running the Windows Service under the SYSTEM account.
In order to solve this you have to provide a different credential on you windows service in order for it to open the connection properly. Make sure that the same windows user is present in the logins of SQL Server for your DB, and that it has sufficient rights to access your tables.
As an alternative you can use sql authentication, by creating a SQL Login and providing the credentials in your connection string.

Connect on Sql Server Management Studio.
Now go Security -> NT AUTHORITY\SYSTEM Right Click -> Properties
Click -> Server Roles
Check public, sysadmin
Click Ok

Authenticating SQL connection using AD login details outside the domain

I am trying to connect to a SQL server from outside the domain.
I have the following connection string:
SqlConnection("SERVER=Server;DATABASE=Database;User ID=Domain\User;Password=password");
When I try to use this outside the domain this will fail as it tries to log in using SQL authentication.
Is there any way to pass a command into the string to use Active Directory authentication.
What other ways would there be to connect to a SQL server, using active directory details outside of the domain?

You either need to:
Use Integrated Security in your connection string and create a domain trust relationship between your resource domain (where SQL server is) and your account domain (where the account is). Or...
Create an account in SQL Server and use that in your connection string as user name and password.
You're doing an invalid mix by putting domain credentials in user/pass and there's not even a trust relationship.
EDIT:
The comments indicate a need to sync SQL account with AD creds. This is not needed. A sql account is simply SQL scoped user name and password which is specific to SQL server and has nothing to do with domain creds. If you use SQL account, then those become a configuration setting in your app which is used to construct the proper connection and sent over the wire. SQL server authenticates those creds locally without involving AD.
It's also interesting whether you create a 2-tier (fat client accessing sql directly) or 3-tier (clients access your middle tier app server which accesses sql). If it's the latter, your application authenticates and authorizes users and after that, it uses a config setting with the sql specific user/pass in it to access sql. If it's the former and you're using sql accounts then you need one per client and that's a problem.

connectionstring with windows username and password, can we?

Can we use windows AD username and password in connection string ? will it work? Users wants to use their AD account to get data from sql server.

You don't need to do this, you can use impersonation to connect to the SQL server using the user that the client is logged in as.
If you configure the application in IIS to require Windows Authentication, and then in your connection string use Integrated Security=true; - then you'll get the permissions of the logged in user when you hit the database from your ASP.Net application.

No. You cannot specify windows account credentials in SQL connection string. You can only specify that the SQL connection will use the integrated security and that will be whoever is executing the code (the application pool identity).
An alternative is to use impersonation. Depending on your application you might set that up in IIS (resulting in all code executing under the privileges of the authenticated user) or impersonate the user manually in code using their username and password as shown on WindowsIdentity.Impersonate MSDN page.