An error occurred while using SSL configuration for endpoint 0.0.0.0:443

First run CMD as Admin

netsh http show sslcert

look for certificates that are dead or the below example Get rid of them by using:

netsh http delete sslcert ipport=0.0.0.0:443

then you should be good.

1. Goto bindings of your IIS website, check if you have a valid cert selected for 443 port.
2. If you already have, check validity of that cert if already exhausted. Try changing cert to see if its corrupted.

Run the following command in an elevated command prompt and examine the config on AD FS side.

netsh http sh sslcert

You will see several endpoints and the certs associated with each. AD FS uses name based bindings so wouldn't create one for 0.0.0.0:443 by default. Unless you have IIS or have been doing your own bindings for http.sys they wouldn't just appear there.

I expect you have an old cert referenced in 0.0.0.0:443 . That's a guess based on the data available.

You should take a network trace and see on WAP service startup whether TLS session is established successfully to AD FS.