Office 365 Mailbox Delegation Not Working – Simple Steps to Resolve Mailbox Issues

There are multiple ways in which data is shared and in Office 365, there are mainly two ways of sharing data. One is by folder sharing and the other is by giving delegate access. Delegate access is a completely different thing from folder sharing where users can access user’s folders. Folder sharing gives the access to the users to view folders but it does not allow them to act on the owner’s behalf for requesting meetings or making email messages. During this, users can face many Office 365 mailbox delegation not working issues.

However, delegation access gives the users this access as per their needs. Hence, users can get both the rights to the access and permissions they need to request meetings and make email messages. In this article, we discuss the steps you should take to solve the Office 365 mailbox delegation not working error. 

How to Assign Online Mailbox Delegation?

When a user is handling another user’s account, it is important to add the other account to their account. This way, both of these accounts can be easily managed without much hassle. 

This can be done only by the owner of the account with their permission.

To assign the mailbox permission, users can follow the steps given below: 

1. Go to the Exchange Mailbox root folder and right-click.
2. From the options that appear, select the Folder Permissions. 
3. Select the name of the delegate with whom you want to share the permissions.
4. In the permission tab, select the folder visible from the others option. 
5. Save the changes by clicking on OK. 

What Should You Do if Outlook Delegate Access Does Not Work?

Here are the points that should be taken into consideration:

Case 1: The Data in the Mailbox is Visible, but the User Cannot Act on Behalf of the Other User.

In this case, the owner of the mailbox needs to give full access to the other users. To do this you need to follow the steps given below: 

1. Use PowerShell with Office 365 
2. Add-MailboxPermission > Identity “Mailbox name” > User “Mailbox Name” > AccessRights FullAccess. Add this command into PowerShell.
3. This will allow users to get full permissions.

Case 2: Users are not Able to Send Out Emails on Behalf of Other Users.

Here are the steps to give access to the users to send emails on behalf of another user. 

1. Log in to the Exchange Admin Center. 
2. Choose the Recipients option.
3. Double-click on the display name and press on the shared option.
4. Choose the Mailbox Delegation option and under the Send As option, choose the user. 

Case 3: Outlook Delegate Access not Working Due to Miscellaneous Issue

1. Assuming that there is a problem with the mailbox, the first thing to do is check the settings. 
2. Confirm the delegation permissions are assigned to which mailboxes. Make sure that all the permissions are granted to the other users.
3. If the permissions are connected properly, then the problem is linked to Microsoft Outlook. 
4. You can try to repair or reconfigure your profile to fix the problem.