Websites showing not secured after SSL renew

Question

We are having AD FS with -

AutoCertificateRollover: True

Once certificate got expired we have renewd SSL certificate and installed the same on ADFS, Proxy & Web server. After that whenever users trying to browse the hosted websites, it is showing

Your connection is not private

Also showing Certificate is invalid. We have uploaded ADFS 2016 logs in https://adfshelp.microsoft.com/DiagnosticsAnalyzer/Analyze and didnot able to find anything fruitful except just a normal warning -

Configuration - Extranet Lockout is Enabled

We tried to check the SSL certificate with differernt online SSL checker like DigiCert, SSLHopper etc and found SSL certificate is fine (although not very sure whether those online SSL checkers are giving correct information or not).
I tried to check Event Logs on all the servers but didn't able to find anything specific or may be I overlooked the logs.
As I am new to AD FS and previous support person already left the organisation, I am not able to figure out the issue and how to solve that. Tried few MSDN Threads and different forums but none of those helped.

Answer 1

We have workshops to help move off ADFS https://techcommunity.microsoft.com/t5/community-events-list/microsoft-workshops-how-to-successfully-migrate-away-from-ad-fs/m-p/3668480 & https://www.microsoft.com/en-us/security/business/identity-access/upgrade-adfs