Custom Fonts on Adobe Express Webpage

Hi there, 

I'm currently creating a webpage on Adobe Express and trying to customize the theme to fit my organization's branding guidelines. However, none of the fonts I uploaded apply when I go to customize the theme. 

I can search for the font names, and they show up but don't apply. The font names aren't included in the list of fonts either. I haven't received any error messages, and the fonts work fine on other Adobe platforms like Premiere Pro, Photoshop, etc. 

I tried using a different browser to see if that changed anything -- it did not. Also cleared my cache, and it didn't do anything either. 

Is there a way to fix this? Our branding guidelines are cruical in our communications.