It seems to me that there is some kind of filter for the recieving number (the number I am trying to register Duo on) that should not be there.
Case in point – I migrated one number from Mtel, now A1 Bulgaria, that starts with +359 88… – registering with Duo went fine, even though the actual operator of that number now is VIVACOM.
When I try to register another VIVACOM number, just starting differently (+359 87…) – I am all out of luck.
The app says “Something went wrong, please try again” and that’s it. On another 87 number it just waits forever to recieve the register code SMS, which does not happen.
Can this somehow be checked?
Thanks!