They support GSuite and azure AD it appears. So it is not limited to just gmail. When you pay for GSuite I think it will be a bit less risky than when using the

They support GSuite and azure AD it appears. So it is not limited to just gmail. When you pay for GSuite I think it will be a bit less risky than when using their free gmail offering. Regardless, it would have been nice if you could use your own identity provider.