Two step verification problem

I am trying to add a deposit method in amazon, it requires two step verification, but I can’t get the code. I am signing in to my account without two step verification. I was getting codes without a problem till may 25, but now it’s not working.

I did not change my phone number

I restarted my phone

I deleted old messages

Restarted the device I was signed in from

Tried the same action from different devices

Still can’t get a code.

What should I do?