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Flow doesn't work for Shared Mailbox; Error:invalid mailbox but mailbox exists and works fine

Created a Flow to Save emails to SP, when a new email arrives in an assigned Shared Mailbox (inbox). Each time I see userid or mailbox error such as this one:


User account or mailbox does not exist. clientRequestId: 26c624ad-2384-4d07-9d79-1114c6961ffe serviceRequestId: 739169e4-68b5-453d-bd3f-133cce15dba3


I tried the no semi-colon method ( ; ) didn't work. 


Checked with the team, I have full access to the shared mailbox. Can someone please review and fix the Shared Mailbox issue at the earliest?


Community Support
Community Support

Hi @Anonymous,


Could you please share a screenshot of your flow's configuration?


The error message told that the email address that you filled within the Mailbox Address field is not existed. Please check if you have provided a proper shared email address within the Mailbox Address field of the "When a new email arrives in a shared mailbox" trigger.


I have made a test on my side and don't have the issue that you mentioned. My flow's configuration as below:13.JPG

Note: The email address that you specified within the Mailbox Address field of the trigger should ends with a semi-colon ( ; ) .


The flow works successfully as below:14.JPG



In addition, please check if the account that you create a connection to the "When a new email arrives in a shared mailbox" trigger has enough permission to access the shared email address that you specified (Check if your account is a member of the Shared mailbox).


Please also take a try to clear cache of your browser and try your flow again to check if the issue is solved.


Best regards,




Community Support Team _ Kris Dai
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.
Not applicable

Hi @v-xida-msft


Did you say the email in the Shared Mailbox field 'should' end with semi-colon?


I saw a whole another post on this channel saying, no semi-colon will work. I am a little confused now. Can you please confirm - semi-colon or no semi-colon?


Thank you very much.

Not applicable

Hello again @v-xida-msft


Tried using a different browser to get rid of any cache memory issues.

Tried with semi-colon - didn't work

Tried without semi-colon - didn't work.



 With a semicolon.jpgWithout semicolon.jpg


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