MSFT is well aware of the issue, but has decided that they are no longer supporting Office 2019, despite the "perpetual" license.
This is clearly planned obsolescence and false advertising. A state AG should investigate.
My, memories are short. In 2008 Microsoft "Play for Sure" became play no more. Exactly the same stunt, 11 years before you bought that perpetual licence. Why anybody trusted the company after Play For Sure was a mystery to me.
And that was just the beginning. Then came Sony being ripped a new one, Azure being taken down by expired certs - twice in 6 months, critical certs signed with MD5 until it's so weak they were exploited, more recently China running rampant in hosted exchange scraping state secrets, GitHub with record down time, and Windows has become a dog slow ad platform. And yet today Microsoft makes the most revenue than any other software firm.
I dunno how they do it. After decades of treating their customers like shit, business has never been so good. They must have one mother of a sales team.
Salesforce, Microsoft, Atlassian, and co. are obviously sold on their merits.