I have roughly 45 fonts I've added to Creative Cloud using .ttf and .otf files.
All show they're installed in CC. They work for about a week, then all of a sudden they become missing in the apps... yet installed in CC. So I have to uninstall them on CC and reupload the font files for them to become usable in the apps again. Really annoying!
I use these fonts often so it's not an issue of deactivating?
Sorry to hear you're having trouble. Would you please share your Adobe ID with me so that I can look up your account? Feel free to send a private message if you prefer.