Code ErrorAcccssDenied Message: Access is denied. during configuring MS GRAPH


Code ErrorAcccssDenied
Message: Access is denied. Check credentials and try again. REST APIs for this mailbox are currently in preview. You can find more information about the preview REST APIs at


The following error might appear if a hybrid environment is used. You can check more info about it via the link:


I.e. mixed Microsoft Azure with Active Domain on-premise. Therefore, these accounts don't exist on Azure but exist on the Exchange server on-premise. As MS Graph is working only with Azure users, it is not possible to authenticate with users on-premise AD. 


As an alternative, we recommend setting up IMAP OAuth 2.0 in such cases or switching to O365 instead of a hybrid environment

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