I have 2 free available slots to register device but when i use the desktop app it says it's not registered and i have to wait a month to change the device despite making no changes this month
Thanks for your post and welcome to our community.
Very sorry you've been having some issues with your devices and for the delay in getting back in touch, we have been busier than normal.
I can help with the resetting the devices from here, I'll just need to pop you a personal message and take it from there.
I look forward to hearing back from you soon.