I'm having an issue getting a verification code for key chain. I've resubmitted my mobile phone s

I Can't get a verification code on my 2nd generation iPad. Keychain asks for a verification code befor iCloud can be completed. I've called support and after 15min. Waiting for an answer they said there was an outage and get back to me. They have not! I went through Apple and confirmed my mobile number. I don't know what to do. Any suggestions would be greatly appreciated.

Thank you, Lornine