A cloud-based identity and access management service for securing user authentication and resource access
Hi @JimG , have you configured Google authentication? I see that you're using gmail, so this may be causing the issue if you haven't done that. Also, please review this document about adding external users. If this doesn't fix your issue please let me know and I can open a support ticket for you.
If this answer helped you please mark it as "Verified" so other users may reference it.
Thank you,
James