"When creating the manifest, please make sure the json file is actually named "font-manifest.json". If you name it fonts.json, fonts won't be baked in the app properly and won't work. (this was the problem this time around) We're looking at "manifest-free"
Thank you for looking at it, RichinZ I'm really not sure where the problem lies. Makes me think it's something in the setup of the cards, even though I've double & triple checked those. I'm sure an answer will present itself soon enough. But that being said, if anyone else has any ideas, I'm open to hearing them!