Apple ID not valid / can't reset password / email not available
HEllo,
My Ipad is linked to one of my e-mail, I forgot the password but I am unable to reset it. I receive the following error message: This Apple ID is not valid or not supported.
I can't even unlink it on my iPad (or reset) as they ask me the password with the e-mail every single time.
I tried to create a new apple id using this email but they say " This email address is not available. Choose a different address."
I am totally stuck, can't update my iPad ... can you guys advise?
Thanks
iPad, iOS 9