Dear Iwantittowork
Thank you for posting in the Microsoft Community.
I understand that you cannot customize the Outlook ribbon. I see that you have selected New Outlook in the board and you mentioned that you tried different browsers. But neither New Outlook nor Outlook web version supports customizing the ribbon. You can only switch between the Classic and Simplified Ribbon by clicking View -> Layout -> Ribbon at the top.
Outlook Classic is able to customize the Ribbon. customizing the Ribbon is the same for all programs in the Office suite. You can refer this link to learn how to customize the Ribbon.
Customize the ribbon in Office - Microsoft Support
Can you take a screenshot to show the problem you are experiencing. After understanding your situation better. I will continue to help you here, thank you for your support.
Please feel free to let me know if you have any further updates, thank you.
Best Regards,
Simon.W - MSFT | Microsoft Community Support Specialist