Confirm your mobile number is correct

For at least three weeks now I have been getting the email "Confirm your mobile number is correct. We recently sent you a text message but unfortunately it was not delivered. Please take a moment to check your account to make sure your mobile number is correct." Each time I have checked and my phone number on file is correct. When asked to confirm, this is what I see: Mobile Number: (xxx) xxx-1636 (the correct number) You can use this to access and protect your account, and manage text communications." And then the following options (no verify options): Manage Text Notification or Change mobile number"