>My company help desk guys revoke user mailbox license when an employee leaves the organization.

>A script is run to convert user mailbox to a shared mailbox where the O365 License is removed. The shared mailbox does not require a license.

>In one case, the script got failed and user mailbox is missing in O365 Where I am unable to find it admin center and everywhere. The one noticed point is I can see a contact with the user email address in Exchange Online admin center which makes me surprise.

>Till now the user mailbox is missing and not seen in deleted items. The Exchange On-premise shows user mailbox exist in O365 but in O365 console its missing. Any suggestion pls guys.