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Is there a way to track which assembly definition a script belongs to?

I upgraded my project to Unity 2021 and have tons of the same error:
error CS0246: The type or namespace name could not be found (are you missing a using directive or an assembly reference?)
This is for both packages and my own scripts. I added an assembly definition in my main scripts folder and tried to add a reference but I couldn't find the proper one to fix any issue.
For example, I'm using the RootMotion FinalIK and PuppetMaster assets. All scripts referencing these have using RootMotion.FinalIK and using RootMotion.Dynamics However, the script doesn't recognize RootMotion.Dynamics and every variable type using RootMotion.FinalIK cannot be found.
Any ideas?

The fix was to just restart Unity and VSCode.

How to fix a 'Microsoft.Office.Interop.Outlook Reference' error?

Visual Studio (2015 Community) does not seem to be recognizing Microsoft.Office.Core or Microsoft.Office.Interop.Outlook as references. A yellow triangle is showing up to the left of both references and because of this and the Using directive 'using Microsoft.Office.Interop.Outlook;' is being flagged as unnecessary. Hence, I cannot call the MailItem class.
Any assistance would be appreciated!
(I'm a rookie, so I apologize if I'm stating something incorrectly)
I was initially using VS 2019 Community and was told that this could be the problem and that I should try VS 2015. I went to VS 2015 Community but the issue still exists.
My code:
using Microsoft.Office.Interop.Outlook;
using Outlook = Microsoft.Office.Interop.Outlook.Application;
-------------------
MailItem email = outlookApp.CreateItem(OlItemType.olMailItem);
When I attempt to build my code then receive the following errors:
CS0234 The type or namespace name 'Office' does not exist in the
namespace 'Microsoft' (are you missing an assembly reference?)
- I get this for each Using directive mentioned above
CS0246 The type or namespace name 'MailItem' could not be found (are
you missing a using directive or an assembly reference?)
CS0103 The name 'OlItemType' does not exist in the current context

I was able to find the solution for this. I did not have the proper Microsoft packages added to the solution. I opened NuGet (tools > NuGet Package Manager > Manage NuGet Packages for Solution...) and searched for the proper assemblies and then added them to the Solution.
This resolved the issue.

You can add this from right clicking add reference,
1. In Solution Explorer, right-click your project's name and then click Add Reference. The
Add Reference dialog box appears.
2. On the Assemblies page, select Microsoft.Office.Interop.Word in the Component Name list,
and then hold down the CTRL key and select Microsoft.Office.Interop.Excel. ...
3. Click OK.
I think it will works for you..

Cannot build with MRTK v2.0.0-RC1

I had tried to make builds of the scene examples of the new MRTK version 2.0.0-RC1 on Unity 2018.3.10f1 but every time with every example there's a build error which says:
The type or namespace name 'HandJointKind' could not be found (are you missing a using directive or an assembly reference?)
The type or namespace name 'HandMeshObserver' could not be found (are you missing a using directive or an assembly reference?)
The type or namespace name 'JointPose' could not be found (are you missing a using directive or an assembly reference?)
Where do I get the library for this namespaces?

These types are part of the upcoming UWP SDK version 18362.
Download 10.0.18362.1 from https://www.microsoft.com/en-us/software-download/windowsinsiderpreviewSDK
In the Unity Build Settings window, change the Target SDK Version to 10.0.18362.0, and make sure that Minimum SDK is is 10.0.10240.0.
This got me past the issue listed here. Then I ran into errors while trying to build the resulting solution. I had to upgrade all projects to C# language version 7.2.

The type or namespace name 'OpenIdConnect' does not exist in the namespace 'Microsoft.Owin.Security' (are you missing an assembly reference?)

I have added a Microsoft.Owin.Security.OpenIdConnect.dll externally(tried both methods using Package Manager Console and using add reference ) to my ASP.NET MVC Application, but still get the same error.
The type or namespace name 'OpenIdConnect' does not exist in the namespace 'Microsoft.Owin.Security' (are you missing an assembly reference?)
I have attached AccountController.cs, packages.config and references
Any help.

You can try with deleting Package folder from source directory (Location: .sln file), then try to resotre packages.
Steps to restore nuget packages:
Right click on solution file.
Select Nuget restore NuGet Package option

I found the solution from Microsoft site
https://learn.microsoft.com/en-us/previous-versions/visualstudio/visual-studio-2012/0e92xd7b(v=vs.110)
Possible causes for this error include the following:
An assembly that contains the definition of a type was not referenced in the compilation; use /reference (Import Metadata) to specify the assembly
You passed a variable name to the typeof operator.
You tried to reference an assembly that is not part of your target .NET Framework profile. For more information, see Troubleshooting .NET Framework Targeting Errors.
In my case, the issue is that an assembly that is not part of my target .NET Framework profile.

ScriptBundle Reference missing

I am building a MVC 3 application. I just added a ADO.NET entity data model.
When i try to build the solution, it gives the following error
The type or namespace name 'ScriptBundle' could not be found (are you missing a using directive or an assembly reference)
I already have reference to Microsoft.AspNet.Web.Optimization.
Please help...

Did you installed it from NuGet package manager? I think that is the reason you are facing the issue
Install-Package Microsoft.AspNet.Web.Optimization