Why are adobe fonts disappearing?

[Stackola]

I turn on the project, the fonts are missing.

I start adobe fonts, can only uninstall the missing one.
What should I do now?

Over and over again something happens with these adobe fonts. Edited
Ai 27.9

[Monika Gause]

Some of the fonts have been licenced from other companies. If those companies end their contract with Adobe, then there's not a lot that can be done about it.

But if that happens you should get a mail that states the reason for fonts being no longer available.

Which font from which foundry was it?

[Stackola]

DIN

After forcing "resolve missing fonts" several times, they came back, but something is wrong because this is not the first time fonts do not work. (Load)

[Stackola]

This unpredictability is a bit concerning for me, I open the project, the fonts are missing. Oh no, again? I have internet?
- You wait, I'll fix the fonts"

[Bobby Henderson]

Aside from the issue of type foundries (such as Font Bureau) removing fonts from the service it's also possible for fonts that have not been used in a long time to be automatically deactivated. Then there is the additional complication with using Adobe Fonts in applcations not made by Adobe; those now have to be installed via the CC desktop app after they've been added at the Adobe Fonts website.

[Stackola]

The fonts are in use every day, and they're probably on disk, too. Programs run all the time. Something is glitching there

[Monika Gause]

Adobe Fonts are not installed on your disk

[Ton Frederiks]

They are installed on your hard disk. If not, you would not be able to use them off line.

[Monika Gause]

true. But are they real font files or something else?

[Bobby Henderson]

Whatever it is (individual font files or a larger clump of cached data) the locally stored data is hidden from view of file managers like Windows File Explorer. Obviously the data is hidden for good reason.  

[Monika Gause]

did you already do this: https://helpx.adobe.com/fonts/kb/troubleshoot-font-activation.html