I have a Microsoft Form that returns a FirstName LastName value for one of the responses. My flow uses the "Search for Users V2" operation on this FirstName LastName to get the UserPrincipalName.

I want to use this UPN as the input for the next action, Get Manager (V2). The problem is that I guess the flow assumes there could be more than one user that matches in the Search User action and automatically tries to do a "For Each" if I use the UPN as dynamic content.

Since I know there will only ever be a single user returned in Search for User, I want to avoid the loop. I am trying to do this with an expression. For the input to Get Manager (V2), I use outputs('Search_for_users_(V2)')?['UserPrincipalName'], but this gives me an error: The 'inputs.parameters' of workflow operation 'Get_manager_(V2)' of type 'OpenApiConnection' is not valid. Error details: The resolved string values for the following parameters are invalid, they may not be null or empty: 'id'
I've also tried it formatted outputs('Search_for_users_(V2)')?'body/value/UserPrincipalName'] and outputs('Search_for_users_(V2)')?['value/UserPrincipalName'].
Here is the raw output to Search for Users:

Thanks in advance!!