The only one who can help you is Adobe. This is not Adobe. Rather user to user forum.
Please contact online Adobe Chat using the following link for Adobe ID, Setting Up, and Account Information (Activation/Deactivation).
It is up to Adobe how it will handle the matter.
We as users have no way to help you other than to advise you to contact Adobe via its online Chat line.
The customer care totally helped in solving my problem. Thank you for referring them to me.
Thanks for the follow up with the great news that online Adobe Chat representative was able to help you sort out the deactivation issue.
That group is very effective, quick, and professional in taking care of issue "more than 2 of your computers with the same purchased activated serial number".
Best wishes moving forward with your Premiere Elements projects.