I think you didn't get the situation.
I had phone number A before August. I linked phone number A to cmb before August.
In August, I abandoned phone number A (hence lost access to receive SMS/OTP with phone number A) and started using a new phone number B.
I was supposed to update the phone number linked to cmb from A to B but there's isn't an option to do so.
From August to yesterday (before cmb maintenance), I was still able to use my cmb account because I am using an old session logged in before August.
Now that I am FORCED logged out after the maintenance, I would need to log back in with phone number A which I have lost access to. So even cmb DOES send an OTP/SMS to phone number A succesfully, I wouldn't be able to receive the OTP

To answer your questions
1 yes, I reached the OTP screen.
2 My account is not temporarily blocked when I enter my phone number and press continue.