I have a workflow that processes email when new mail arrives and redirects based on the subject to a particular SharePoint / document library. Intermittently I appear to be getting the following error on the "When a new email arrives".
I suspect the error message should be related with the connection credentials.
Please take a try to update the credentials under the connections manage page, see if that would help:
Manage connections in Microsoft Flow
Error code 520 means the response from the Service can't be recognized, please check of the Email arrived in the Mailbox, see if there are any difference.
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