Hi, ALS Shayne
Good day!
Thank you for posting to Microsoft Community. We are happy to assist you.
According to your description, the issue of your concern that your Format Text Tab in Ribbon is missing.
We truly understand how frustrating it is. Sorry for your experience.
Since the issue happened on your desktop client, could you please be kindly to share your detailed version and we can have a check on our side to see if there's a same issue.
In order to protect your privacy, please share the screenshot of your view in Private Message as following steps:
Please click account you logged in on the up-right corner - My profile - View private messages to get it.
To get your detailed client versions, please refer below:
In Outlook > File > Office Account > Product Info
We're glad to assist you and looking forward to your new updates.
Sincerely,
Alex | Microsoft Community Moderator.