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Can't open UserMailbox

Anonymous
2023-04-26T12:37:51+00:00

Currently we have three mailboxes.

From user A I am able to open user B's mailbox, however when i try to open user C's mailbox the following error occures.

![](https://learn-attachment.microsoft.com/api/attachments/5fc9196e-a380-401b-98a4-0df5578ca5a7?platform=QnA

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  1. NoOneCan 7,795 Reputation points Volunteer Moderator
    2023-04-28T06:47:39+00:00

    You may try cmdlet below to check this issue.

    Remove-MailboxPermission -Identity <MailboxIdentity> -User <UserIdentity> -AccessRights FullAccess

    Add-MailboxPermission -Identity <MailboxIdentity> -User <UserIdentity> -AccessRights FullAccess -AutoMapping $false

    If you already tried still having issue then open a support ticket or contact phone support for further help. See https://learn.microsoft.com/en-us/microsoft-365/admin/get-help-support?view=o365-worldwide#online-support

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  2. Anonymous
    2023-04-27T18:42:21+00:00

    Yeah UserC has directly access. When i grant UserA permissions trough the GUI the box automatically appears within 5 minutes. However I want to add it manually as a seperate account (because the "send from" is adjusting according to the folder the user is currently in).

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  3. NoOneCan 7,795 Reputation points Volunteer Moderator
    2023-04-27T13:30:16+00:00

    >>>

    when i try to open user C's mailbox the following error occures.

    <<<

    May I know whether user "C" directly access his/her mailbox using OWA without any problem?

    If so, you may try to remove permissions using cmdlet (Remove-MailboxPermission) and wait for sometime then re-add to see if there any improvement.

    Add-MailboxPermission -Identity <MailboxIdentity> -User <DelegateIdentity> -AccessRights FullAccess -InheritanceType All [-AutoMapping $false]

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