Hi @j-d-koning_0111,
Just wanted to check in if PG-2738 fixed your issue. We have also been working with another customer that has had similar issues. We determined this was related to setting to Map groups to SAML groups setting. If you have this enabled and do not have any groups claims sent, it was causing the error you saw above. This last issue, PG-2745, will be released in the next maintenance release. As a work around, make sure you have your SAML provider configured to send groups claims.
Thanks,
Rich