Adobe Fonts not activating
When I need to activate a font from Adobe Fonts directly from Find Font context menu inside InDesign, it keeps loading indefinitely but never actually activates.
The only solution is going to Adobe Fonts web page and activate it there.
Anthony van Duyn commented
In my case, I was working on my *.indd file with Trajan (which I have ALWAYS had activated) and when I woke up and reopened the file it wasn't happy. Waited 24 + hours and tried again. Simply would not activate! Checked software update status which was perfect (and it hadn't self updated in that time).
Like you, I found I had to go to Adobe Fonts and deactivate and reactivate! Thank you as your experience helped me.