@Tony Perkins I see that you have a case open - I'll reach out to the case owner and identify where that case stands.
I will say that we had extended the deadline and so if you were able to text before the SMS registration process, you should still be able to.
I would make sure to discuss this with Support when they reach out to you.
If you run into challenges, I would encourage you to circle back here or shoot an email to Community.Support@RingCentral.com
Please try quitting and restarting the app to see if that resolves the issue. If it does not there is a good chance your number was flagged by a carrier, aggregator, or spam agency.