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Email arrives in shared mailbox - Error authenticating with resource


This flow works for SOME shared mailboxes and not for a few others

The mailboxes causing errors are created further in the past compared to the mailboxes where the flow works. Otherwise, I can not find a difference. 

The email used as connection has access to the mailboxes. 


Any ideas how to troubleshoot? Or, anything I can do or ask about related to the shared mailboxes?


400 - "Error authenticating with resource client"



Super User
Super User

@Flawsome does this error occur for any shared mailbox or only a specific mailbox? Does the account used in connection as Power Automate license?

Anna Jhaveri

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