In the sync logs you see the following Fanout error message:
Alternatively in the api logs when sending an email http_response 504
ErrorInternalServerError: An internal server error occurred. The operation failed., Error in fanout. MessageText: The specified object was not found in the store., The process failed to get the correct properties.
This is due to a configuration issue on the exchange end. A few suggestions that have assisted the mail administrators in the past:
- If this is a hybrid environment ensure the mailbox is on O365 not on-premise.
- Where possible try and move the mailbox to another mailstore
- Is this a shared mailbox - see
- If it's a new user ensure it has a mailbox with something in it
We are not 100% sure of how to resolve this and would appreciate hearing back from the mail administrator as to what worked for them.
A known solution is to provision a new mailbox.
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