Non Profit Step 3 does not work

This is not "solved." I had a lengthy exchange with Microsoft Support and they determined the issue is being caused by VOIP numbers not being supported. Of the two numbers I tried to use for verification; one was a VOIP number and the other was a landline, neither of them worked. The technician I was working with, who was great by the way, escalated me to his supervisor but the supervisor only regurgitated what was already told to me. I'm still waiting on a resolution.