For your protection and security, we encourage all users to update and verify their mobile number under Settings >> Manage Profile >> User Settings. If you are a Super Admin/Admin user or Custom Role user with admin permissions trying to access add/edit/delete functions, you will be required to enter Two Factor Authentication Code.
You might be interested in the following questions
Which add/edit/delete functions require Two Factor Authentication Code?
Which add/edit/delete functions require Two Factor Authentication Code?
How can I verify my mobile number to receive Two Factor Authentication Code?
I am unable to verify my mobile number; how do I receive Two Factor Authentication Code?
My mobile number has changed; how do I update it to receive Two Factor Authentication Code?
Do I have to enter Two Factor Authentication Code every time I access add/edit/delete functions?
My mobile number is updated and verified, but I am not getting a Two Factor Authentication Code?
I received multiple Authentication Codes, which one should I use for add/edit/delete functions?