SAML would be the key to enable many SSO services. Open Id Connect with OAuth would also be a great alternative.

Many smaller companies are using AAD - Azure Active Directory nowadays. So are we, teampass is our solution from the moment we can use AAD SSO.

https://docs.microsoft.com/en-us/azure/active-directory/manage-apps/what-is-single-sign-on

https://docs.microsoft.com/en-us/azure/active-directory/hybrid/how-to-connect-sso-how-it-works

I was already testing to connect teampass to AAD by bridging with LDAP. Anyways users have to login again into teampass.