Thanks to : https://www.outlook-apps.com/inactive-outlook-add-ins/
For me it was sufficient to do the following:
1) Close Outlook.
2) Remove the key in the registry: HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Outlook\Resiliency\DisabledItems. Find the one which links to UCAddin.dll and remove it.
3) Start Outlook again.
4) Enable the Add-in like File -> Options -> Add Ins -> Go -> Check the Skype Add in. (The Load Behaviour should say "Load at startup" now.
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