Postgresql 11 SSPI authentication failing
If you are authenticated as "SrvSupportPsgr@domainname", then that is what needs to be in the 2nd column of pg_ident.conf; including the "@domainname" part.  (Or it could be a regexp which matches to that)

Also, pg_ident.conf is case sensitive.  In the third column, "SrvSupportPsgr" is not the same thing as "srvsupportpsgr".