Shared Mailbox Online-Archive not showing in Outlook client BUT does show up in OWA

[dirkverhagen123]

I have searched Google and Bing on this topic found a lot of posts but no one is really answered or is the same as my situation.

We have hybrid Exchange 2010 and clients are Windows 10 with Office 365 ProPlus.

All users have O365 E3 licensed and Shared Mailboxes have Exchange Online Archive plan.

Shared Mailboxes with Archive enabled are in Office 365.

For users we assign Full Control on the Shared Mailbox.

The user can add the mailbox via more settings>advanced as additional mailbox and user sees the Shared Mailbox in Outlook but the user does not see the Archive of the Shared Mailbox in O365.

I know the post below and we have E3 so the archive should be shown but its not visible.

We tried

- via OWA the archive is visible

- removed and re-add the additional mailbox via more settings>advanced, still not visible

- waited 2 days

- removed Outlook profile and created a new one, after that still no archive visible

- completely removed the Windows profile of the user, after that not showing archive.

Outlook license requirements for Exchange features

I'm completely out of idea's why archives are not showing

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