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heinzelrumpel's avatar
heinzelrumpel
Brass Contributor
Nov 18, 2025
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Multitenant collaboration with existing guest users

Hi,   we plan to set up Multitenant collaboration with a few tenants. Regarding this project I got 2 quesstions:   1.) what happens with users from one MTO who is already present as a guest users...
  • Kidd_Ip's avatar
    Nov 19, 2025
    1. Existing guest accounts are not merged into member accounts when you enable Multitenant Organization (MTO). Instead, cross-tenant synchronization creates a new “member-like” representation of the user in the target tenant.
    2. Yes, users accessing resources in another tenant are subject to that tenant Conditional Access policies, even if they are members of a different MTO. Your 9 hours reauthentication policy will apply when they sign in to your tenant’s resources.

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