Maintain control of your Microsoft Office 365 data
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Posts: 63
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Joined: Nov 21, 2017 7:18 am
Full Name: Peter Helfer

O365 Groups Mailboxes

Post by MCH_helferlein »

Hi Forum again.

Somebody there who can point out what's the solution for this error while backing up O365 Groups Mailboxes:
Processing mailbox failed with error: Failed to access mailbox.. Access is denied. Check credentials and try again., User '/o=ExchangeLabs/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=user1a4dc7bb' not authorized to access group ''. Reason: '(0x4D10)'.
Normal Mailboxes, Sharepoint Sites and OneDrives are backing up without problems.

Did I miss a setting?

Veeam Software
Posts: 1307
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Joined: Oct 21, 2011 11:22 am
Full Name: Polina Vasileva

Re: O365 Groups Mailboxes

Post by Polina »

Hi Peter,

Without seeing your logs this will be a guesswork. Does it happen within a hybrid or Online scenario? what type of a group is it? and so on.
Can you please open a support case and post its ID here, so that we could track the investigation? Thanks!

Mike Resseler
Product Manager
Posts: 6158
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Joined: Feb 08, 2013 3:08 pm
Full Name: Mike Resseler
Location: Belgium

Re: O365 Groups Mailboxes

Post by Mike Resseler »

From what I can see, the user that you use to connect to the office 365 environment has not access to that specific group and can't enumerate the data.

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