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These clients are in different states, so I know it isn't something with the phone company. I have tested the phone numbers and they are working.
Does anybody have any ideas what is going on? I did find one thing that said that the "Phone verification is not working" on Google's Known Issues, but I am not sure if that is that when people are getting the phone call it is not working or if others are having the same issue as I am.
Does anybody else have this problem and/or know of a solution?