No - but the filemaker roadmap webinar the other day said that they will have oauth2.0 support for google, amazon and azure AD authentication in the next version of fiilemaker. Because FM cloud can get updated sooner than FM they could in theory release that functionality sooner.
We use it as well and it's one of the less desirable functions of FM Cloud.
The alternative of course is to run a few AD controllers in AWS and just run FM Server on a standard windows machine until they get it released.
If you haven't yet looked at the AD Connect / Sync for Azure AD -- you might want to look into getting that setup for other integrations down the road.