Same thing happening to me. I’ve had a question open for 2 weeks that I’m unable to mark as answered.
Request URL: https://github.com/DuendeSoftware/IdentityServer/discussions/364/comments/1197403/mark_as_answer
Request Method: POST
The response HTML says:
Your browser did something unexpected. Please try again. If the error continues,
try disabling all browser extensions.
However, I’ve tried 3 browsers: chrome, edge and firefox. This has been an issue for at least 12 days.
Also as an aside: kind of funny how my github username is not acceptable in the community. My github username is “john–”, which is invalid here. It tried to autofill it during registration, which made the process a little clunky (only way to enter a different name was to delete the “disabled” attribute from the text field).