Fonts not working in App

Hey everyone, 

I've got a problem with the fonts I uploaded to Adobe Express on my desktop. 
Weirdly they are working on desktop and the app on my iPad but not on my cellphone. That's really inconvenient and I hope to find an answer here how to fix this problem. 
I tried logging in and out of the app multiple times and also deleted the app of my phone. However non of it is working. 
If I save a project with a font I licensed on my desktop and later want to open in in app from my cellphone, I get the notification the the fonts are not available, even though I have no problem using them on desktop and on my iPad. 
I hope someone can help me. 
Kind regards, 

emily