I have the dice on the website on my computer and my phone, but my DnD Beyond app  doesn’t show they exist at all. I have signed out, deleted and reinstall the app and restored purchases synced entitlements and everything else that I can think of. 

Same here. I have them on my online account but not showing up in the mobile app.  I’m not even sure where I got them. Subscriber perk for April?

Solution. Re- claim the honor among thieves bundle on your mobile device. 

https://www.dndbeyond.com/claim/bundle/dungeons-and-dragons-honor-among-thieves

I do appreciate this, but it’s essentially the same problem. It’s a hyperlink to the website  to the content that the app doesn’t seem to have anyway to access it

Actually I think it just took some time with that link to work. Much appreciated.