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The issue is the relationship type behind your Measure Owners grid. With Team Template set to Measure Access Team, the grid uses Dataverse Access Teams, not a standard N:N relationship. Relate Rows works on Add because Dataverse silently provisions the access team buffer and adds the user as a member. Unrelate Rows does not consistently reverse this through the same path. The supported way to manage access team membership is through two unbound actions: AddUserToRecordTeam and RemoveUserFromRecordTeam.
Add a user
In Power Automate, use Perform an Unbound Action with these inputs.
Remove a user
Same action shape, with Action Name set to RemoveUserFromRecordTeam and the same three parameters.
Why your update flow fails
The Dataverse trigger gives you the modified Scope row but no previous values. You need both old and new to compute the diff. Three patterns work.
Pattern 2 is the most reliable for production.
Steps:
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