The solution you provided worked out of the box. However, for some reason, it's still not picking up the attribute in my projects. The following are differences between our solutions and what I've tried:

• I'm using .NET Core 3.1 instead of .NET 5. I downgraded and it did not change anything.
• I'm using MSTest instead of NUnit. Changing it didn't affect anything.
• I was missing the --exclude "[FCCExcludeFromCodeCoverage]*" from mine, but adding it in didn't help.

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Is there a way to reset the options back to default? Maybe I somehow messed them up since I was missing --exclude "[FCCExcludeFromCodeCoverage]*".

The exclude "[FCCExcludeFromCodeCoverage]*" is the result of applying the attribute to a project called FCCExcludeFromCodeCoverage that is referenced by a test project.

You will have to provide your solution for me to comment further. In particular the .csproj file that you have annotated.

Also framework version and test framework should be irrelevant.

Can you show how you are referencing assemblies from the test project ?

You could just use the assembly attribute ExcludeFromCodeCoverage. FCCExcludeFromCodeCoverage just is a helper that provides the same functionality for .NET Framework.