Shared mailbox headache! What used to work no longer does. 404 error

[Rob_CTL]

Hi,

Ok I am having a bit of a melt down here.  In the past I've been able to configure Flows to monitor shared mailboxes and react when an email arrives.  However for some reason I can't get this to work now, lots of errors.

Scenario:

Shared Mailbox called "Shared".  User called "Tom" has access to the shared mailbox, he has full control access and send on behalf of.  Tom logs into OWA and is able to access the shared mailbox through the "open another mailbox" dialogue.  Tom can also send email from the Shared mailbox through OWA.  So I am confident that Tom has the permissions that he needs.

Issue:

Login into Flow as Tom and create a new flow.

Select the "When an email arrives in a shared mailbox" connector and this connector uses Tom's credentials to connect to Office 365.

Enter the shared mailbox address on the "Mailbox Address" box, this resolves properly (proves GAL is working)

Click on the folder icon to expand the folders and I am greated with this error:

I've read on the forum that the semi-colon at the end of the name can cause this, so I remove this and then the error changes to:

Awesome!

If I ignore this and contine to configure the rest of the flow, this flow basically takes the email and fires it into a list.  Nothing to complicated.  The SharePoint connector uses Tom's credentials to connect to SharePoint Online and I can select the list I want to update.

Ok, last step is to run a test of the flow.....and as expected this fails with the following error:

Nice 404 error.....argh!

Any thoughts on what is going wrong here?  I've created a lot of these flows in the past and never had an issue, until now.

Thanks in advance

Rob

[v-yamao-msft · Accepted solution]

Hi @Rob_CTL,

Do you want to change to another folder?

I have made a test on my side with the trigger When a new email arrives in a shared mailbox. Without changing the Folder, I entered the email address into the mailbox address, the flow was successfully triggered and it didn’t return any error message.

Please take a try with it again on your side.

However, when clicking the Show picker of the Folder field, it does return the error message you mentioned. I will help confirm this issue on my side.

Best regards,

Mabel Mao

[Rob_CTL]

Hi @v-yamao-msft

Thanks for the reply.  Looks like if I "test" the flow it fails, but if I leave it and let it trigger when an email arrives in the shared mailbox it does fire.  Seems a bit slower to trigger than other flows I've done but that is probably my imagination.  I would be really interested to know why the error is happening as this is off putting when building flows.

Thanks

Rob