If you can't deactivate a serial number you have to contact the Adobe support. Only they can reset the activation counter.
This is a public forum and not the link to Adobe support. We're all normal users as you are.
Sorry, nobody here can help with an account or payment problems
Be sure to be signed in with your Adobe ID before accessing the link below.
Do be aware that Adobe's staffing is also impacted by the virus and so wait times can be a little are longer. Make sure that your browser does NOT block ads, scripts, or pop-ups.
Please allow 'cookies' in your web browser for the link to work
This link will go directly to the chat option
Type "Agent" in the chat box to bypass the chatbot and be connected to a person
-Meaning type in the word Agent without the quote " " marks
ASK ONLY FOR ACTIVATION SUPPORT TO ADJUST YOUR ACTIVATION COUNT
You may have to be PERSIST or TRY SEVERAL TIMES to find a more experienced support professional.
My System: Intel i7-8700K - 64GB RAM - NVidia Geforce GTX 1050 Ti - Windows 10 Pro 22H2 -- LR-Classic 12.2.1 - Photoshop 24.3 - Nik Collection 5 - Topaz Sharpener AI