Using older versions of Outlook for Mac in business environments
Hi Omar,
Thanks for the update. If you are using 2-step verification may try using an app password (also known as an application password) to check this issue. This is a different password than your regular email account password.
If the suggestion above doesn't help, please use the contact support option to report this issue and get the dedicated support within the Outlook for Mac for further assistance. Open Outlook and select Help > Contact Support.
Your understanding is highly appreciated.
Best regards,
Shyamal