A feature that allows users in the U.S. to participate in GroupMe chats via standard text messages, without needing the app or internet access.
Hello, thank you for reaching out to Microsoft Q&A.
Do you have a backup code instead? (as shown in the screenshot)
If "yes", you can use the backup code and see whether you can sign in to your GroupMe account successfully.
Or, try connecting your device to another Wi-Fi network, such as a mobile hotspot, and see whether you receive the verification code.
Also, make sure your phone isn’t blocking texts from unknown numbers.
Go to your phone’s message settings and check the blocked senders list. If Microsoft’s number is on the list, remove it and try requesting the verification code again.