Certificate Authentication custom authentication does not work

### Description

I followed the instructions precisely in my implementation; however, the browser prompts me for a certificate, and no matter what certificate I select, I am always allowed to view the swagger UI for my API. My custom authentication works and calls context.Fail("Fail reason"); but that code does nothing. It still authenticates and displays the swagger UI. Please help.

### Page URL

https://learn.microsoft.com/en-us/aspnet/core/security/authentication/certauth?view=aspnetcore-8.0

### Content source URL

https://github.com/dotnet/AspNetCore.Docs/blob/main/aspnetcore/security/authentication/certauth.md

### Document ID

d2db534b-198a-dc99-5b5a-0525582d39ac

### Article author

@blowdart

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