What is the final Mac OS for Microsoft Office 2019 ?

It's unreasonable to expect Microsoft to be able to answer compatibility questions about their own products ?!?!?!?

Your tag line says that you are running macOS 12.6 (Monterey). You'll have to ask Microsoft about compatibility – but since Monterey is not one of the three most recent versions of macOS, it sounds like Microsoft doesn't support running Office 2019 on Monterey now – whether or not they ever did.

Microsoft Support – Office 2019 for Windows and Mac FAQ

"Note: When a new version of macOS is released, Office 2019 for Mac’s Operating System requirement becomes the then-current three most recent versions at that time: the new version of macOS and the previous two versions."

Hello

My daughter has got a Mac Book Air M3 bought this Christmas now has Sequoia OS .

She ported her MS Office 2016 online download and works very well.

When she first signed in her MS Office 2016 for Mac , her new Mac book Air M3 wanted to her to approve "Rossata"

That my penny's worth if it helps you.

I'm running MS Office 2019 on my 27" iMac with Monterey. It works fine but MS does not provide any more updates.