Unable to reactivate my Trados Freelance 2021 after I changed my host pc name. I thought it was the time when my account turned deactivated. I numerously tried to enter my activation code but it doesn't work .

Unable to reactivate my Trados Freelance 2021 after I changed my host pc name. I thought it was the time when my account turned deactivated. I numerously tried to enter my activation code but it doesn't work .
Plus, reactivation on SDL site or deactivation online per your instruction doesn't work either.
Plus, reactivation on SDL site or deactivation online per your instruction doesn't work either.