No Addin will show up in ECP. Exchange doesn't support the requested version.
First introduced in Exchange 2013, add-ins are apps that you can globally distribute to all your Outlook clients, whether they be the full Outlook client, Outlook Web App, or, Outlook for iOS and Android.
Add-ins include features such as Bing Maps, which will identify an address in an email and automatically load a web-part displaying a map. Or, simply the ability to identify action items within an email.
Metalogix Archive Manager solution offers Addin for OWA access, too.
While in coexistence with an older version of Exchange your users may receive the error “There was a problem loading your options”. They receive this error when trying to manage their add-ins via Outlook Web App. This error prevents users from seeing or managing their add-ins.
The fix for this one is quite simple. This issue arises when the arbitration mailboxes are still located on an earlier version of Exchange. To fix this issue we simply need to move the arbitration mailboxes to Exchange 2016.
To find arbitration mailboxes open Exchange Management Shell and run the command Get-Mailbox with the Arbitration switch.
From this output, we can see all of our arbitration mailboxes are on a server identified as EX13-01. This server is an older Exchange 2013 server.
To move all arbitration mailboxes to a database on Exchange 2016 we can simply pipe Get-Mailbox -Arbitration into a new move request. For example:
To target arbitration mailboxes on a specific database we can include that in our Get-Mailbox command.
You can monitor the move requests by running Get-MoveRequest and optionally pipe it into Get-MoveRequestStatistics.
Once all move requests are complete you can verify which server the arbitration mailboxes are located on by rerunning the Get-Mailbox -Arbitration command.
If you successfully moved your arbitration mailboxes to the latest version of Exchange your users should now be able to see and manage their add-ins via Outlook Web App.
