Are there specific ID providers or protocols that are particularly difficult to support? Would it make sense to bracket out SSO further between: - Providers th

Are there specific ID providers or protocols that are particularly difficult to support? Would it make sense to bracket out SSO further between: - Providers that actually implemented SAML correctly and that we can support without being buried in tickets - Shitty Enterprise Grade™ systems you wouldn't dare to use voluntarily - Oh god you actually wrote your own IDP what is this cursed mess