Hello pierres79485853
We apologize for the inconvenience caused, as per the description above, you are not able to activate the Acrobat Pro DC subscription, Is that correct?
The record shows that you are subscribed to an active license of Acrobat Pro DC on your current Adobe ID, please sign out and sign back in with your Adobe ID and password in Acrobat Pro DC and see if this brings any difference.
You may also refer to the following KB docs to resolve the activation issue Convert Acrobat Pro DC trial to a full license
Troubleshoot activation | Acrobat DC subscription
You may also refer to Resolve connection errors with Adobe Creative Cloud and Creative Suite applications
Let us know how it goes.
Regards,
Anand Sri.