Is there an option to use GSuite to login into Testrail instead of testrail managing the users?
did you check this?
But this is only for Authentication purposes.
We used LDAP and this was working quite good. But the user management itself is still done in TestRail.
SSO is only supported in Enterperise edition?
I’m not sure.
The SAML 2.0 Single Sign-On support is only available in the Enterprise Edition, but I’m not familiar with it.
The Integration mentioned above was available before (IMHO). And the custom authorization sounds a possible way (not solution) for you.
So, my first reply was not complete - sorry. But not sure if SAML 2.0 will solve your request. Even if you have the Enterprise Edition.