I have serial number for my Adobe CC but when I open InDesign or Photoshop it says I have 3 activations and must deactivate 1. I have only 2 installations. Nothing is in my Adobe Account either

Are you sure you are not using Adobe CS? 

I believe CC was always subscription based without a serial number. 

What versions of InDesign and Photoshop are you using? Also, what operating system? You mentioned “serial number”, so I assume these are antique pre-subscription versions. In which case, you’re most likely out of luck as their activations cannot be managed anymore.