Hi,
Thank you for sharing your question. I understand how confusing and inconvenient it is when you have just installed the latest version but Outlook or Microsoft AutoUpdate reports that an older Office 2019 version is no longer supported. This usually happens when remnants of Office 2019 are still installed on the device, and Microsoft AutoUpdate detects those older components before it recognizes the new 2024 apps, which prevents updates from completing correctly. The best step is to fully remove any leftover Office 2019 files by using the official uninstall steps for Mac, then restart your device and run Microsoft AutoUpdate again to confirm that only the 2024 suite is detected. Once the older version is removed, the 2024 applications should update normally without showing the unsupported version message.
I hope this helps.
Best Regards,
Noel