One of the most common reasons for Gmail promotions tab not working then here are series of steps that users need to follow. To start with, launch Google Chrome and proceed to Gmail.com. Now, click on gear icon which is located at the upper-right corner of Gmail window and then choose to see all settings. After that, choose forwarding and POP/ IMAP tab at the top of the page. Lastly, click on add a forwarding address in the forwarding section. These are the steps that users need to follow to resolve Gmail promotions tab not working