OTP not showing on keyboard.

I iPhone XR. OTP at first worked, now it does not work. Why is that?

I have checked multiple times, everything it's ok.

Password autofill works ok, only one time password OTP verification, does not appear on my keyboard. I have emoji and 3 other language keyboards. I receive the code, but the code I receive by message, it does not appear on my keyboard. I should go back to sms, and then back again to the app/or the site I am receiving that passcode.

Please help.