Dont know if this is the reason you cannot get your registration number from your MEU1 8 digit number when we got registered with gesy they have a 0 at the begining making it 9 digits long but give them a ring.
Just of passing interest, my GP sent me her registration form. I then took my required docs to her office. Her staff then filled in the Gesy forms for me. I only have to return to her office to sign the required paperwork, i am so grateful for this help as I didn’t have to go online and fill in the forms there which looked problematical. They were doing this for all their patients.
Dee