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I have been trying to roll out an MTO as per Microsofts guides and its not working as I would expect. I have MS support on it but I think even they don’t know.

I have 1 master Tennant - Call it UK Primary
This tenant hosts sharepoint and teams channels
I then have 3 other tenants - A, B and C that I want to pull into the UK Primary tenant to share sharepoint resources, teams channels, etc without making additional guest accounts, it should all work using Tenants A, B, C,'s native user principal name/email address. I dont need UK Primary users showing in the other tenants as all sharing is inbound to UK Primary

I want all users from A, B and C in the UK Primary tenant but I don’t want all the users from the other tenants in each of the others (make sense?) So I dont want users from A in tenant B or C, all I need is inbound from A, B and C into UK Primary.

It seems if I set my MTO sync policy to All users, I get all users in every tenant. If I select “only users or groups” in the UK Primary MTO sync policy, this updates it at both ends.

Im also seeing multiple tenants in teams where there should only be 1

Has anyone successfully set this up?

3 Spice ups