Hi @Erwan CSN ,
Welcome to our forum!
Please kindly understand this forum here is only support English, so we suggest to use English to describe the problem. I tried to use machine translation to understand your problems, if there is any discrepancy with your expression, please forgive me!
I understand that you want to disable Teams Meeting add-in in Outlook desktop client, right? If so, please try to change the following registry and restart Outlook again:
Locate to: Computer\HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Resiliency\DoNotDisableAddinList
And delete the TeamsAddin.FastConnect key. Then restart Outlook to check if the Teams Meeting add-in will be enabled again.
Hope to help you!
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