Blazor - Identity Scaffolding Fails

Hi all, trying to scaffold identity into a blazor app. I have an AuthDbContext that looks like this
public sealed class AuthDbContext(DbContextOptions<AuthDbContext> options)
  : IdentityDbContext<IdentityUser>(options);


When in the scaffolding wizard, I select this db context. It works up to a point, but then I get an exception popup from Visual Studio:
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Microsoft Visual Studio
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Error

There was an error running the selected code generator:

'value cannot be null or empty

Parameter name: projectRelativePath'
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OK   
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Googling this issue doesn't find me any results for this particular error. Any ideas?
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