Gotta admire the way they worded the dialog box.
"uBlock Origin was turned off. This extension is no longer supported. Edge recommends that you remove it."
I have a few decades of experience with the Internet, and even I understood the dialog box as saying that Ublock didn't work anymore. In reality, as the text says, it still works if you click "Manage Extension" and turn it back on.
This infuriates me.