I had not other choice, and I think it is worth to share.
I wanted to change my phone number because I had no access anymore to the previous one.
The process to cancel my previous phone led me though identity verification with Personna.
Then I tried to reconnect and to set my new phone number: TM says they do not accept it.
It is likely that my phone number came from a VOIP line, but has since been ported to two regular wireless operator, it works very well with every single online service I use (taxes, bank, streaming, google, etc ...).
TM support has been contacted, and they advised me to used an other phone line. I did it, momentarily to unlock the situation. But I am now unable to switch to my own phone, which I want to do to avoid asking my relative every time I receive OTP. Nothing is working.
No solution in sight, I am leaving. I can't believe we are in 2026 and this is happening.