My primary email is at outlook.com, is attached to the MS Exchange server and is running on a Dell desktop PC. The release is up to date, I've uninstalled and reinstalled Office 365 several times including a clean install after running SetupProd_OffScrub. I've run SFC and DISM. The Office 365 install is the 32bit version due to some custom Excel files with VB code. OS is Win11 Pro 21H2 build 22000.675 (both PC and laptop). I have 3 devices running Outlook, all my devices are running the same set of plugins for Office. Of the 3, only the PC is having the problem.
No matter what I do, the focus inbox is not available in my account on the PC. It was missing from the View ribbon. I went in and added it manually to the View ribbon. While the tab shows, the icon isn't there, the tab is blank.
I've compared (Notepad ++ compare tool) the autodiscover.xml files for my Outlook 365 account on the PC vs the laptop (both Win11 same release and version) and no differences in the two files were identified. The auto discover appears to be working since the autodiscover.xml file time stamp is changing each time I restart Outlook. All my devices are on the same local network and access the Internet through the same router. Only the PC is connected by a wire, the other two devices are wireless.
I've scanned for virus and malware and nothing was found.
Another account - wife's, separate log in, on the PC with an Outlook email account has focus inbox available and working. Focus inbox is available and working for my account on the Outlook.com website, a laptop I have with Office 365 32bit installed, and the Outlook app on my iPhone. Focus inbox is also working on the built-in Mail client in Win11. So, it appears to be something specific to my PC login and Outlook 365 combination on the PC, both using my MS login.
Focus inbox was working on the PC until just recently, but can't say for certain it was working prior to the last patch Tuesday release.
I've tried every potential fix found searching the net and have had no success in resolving the problem. Looking for other ideas to try.