Hi @Ron !
Apart from Allowlisted Domains, I can only think of the things you seem to already have thought of.
Services that work with trusted domains
- Google Drive—Users can share files with domains on the allowlist.
- Classroom—When you put a domain on the allowlist, your users can join classes in that domain and users in the allowlisted domain can join your classes.
- Google Chat—Users in a trusted domain can chat with users in your organization. Depending on your Google Workspace edition, your users can create and join one-to-one messages or spaces that include users in a trusted domain. Not supported for Enterprise Starter.
- Looker Studio—Users in your organization can access assets from domains on the allowlist.
What I can offer is a method to sync the two Global Address Lists, as I've inspired GAM developer @RossScroggs to create a GAM script for doing that, which you can find in his github.
Be aware that it's not a script you just run! Most GAM7 companion scripts have a lot of text inside them explaining their use.
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https://wheretofind.me/@NoSubstitute