Messages "Text Message Forwarding" is not showing the verification code in Messages on computer:
If this solution solves your problem, please send me a quick email to let me know if it works for others: DannyBoy888888@icloud.com
ON YOUR COMPUTER:
1. Messages (Computer): Preferences: Accounts: Apple ID: Enable this account.
2. Messages (Computer): Preferences: Accounts: You can be reached for messages at: (Select your phone number).
3. Messages (Computer): Quit Messages on your computer, and do not reopen it on your own. It will automatically launch when the Verification Code is initiated from your iPhone or iPad.
4. Apple Menu (Computer): System Preferences: iCloud: Keychain (Ensure that Keychain is checked, and that it does not say "pending.")
ON THE INTERNET:
5. Verify that you have the correct cell phone number entered at: https://appleid.apple.com
a. Manage Your Apple ID: Phone Number: Mobile Phone (Verify that your cell phone number is correctly entered).
ON YOUR IPHONE OR IPAD:
6. Turn on Keychain on your iPhone or iPad.
a. Settings (iPhone or iPad): iCloud: Keychain (Ensure that it says "On").
b. Settings (iPhone or iPad): Messages: Text Message Forwarding: (Select your Mac).
7. If Messages (Computer) automatically launches by itself, after you initiate step 6b, then you have successfully selected the correct device. If iMessages does not automatically launch, then it is very likely that you have selected the wrong device.
If this solution solves your problem, please send me a quick email to let me know if it works for others: DannyBoy888888@icloud.com