I think it's just me, but they haven't explained why.
They told me I probably got logged out, to hit the gear icon (yes, in the app) and scroll down to the card and try to log back in. That is, re-associate the card to the app.
Well, I did that but it just gives the bouncing 'b' logo then an "Oops..." page.
Today the card is completely missing so I can't even re-add it.
Have you tried to update the app to the latest version?
They recently updated to 10.0.3 version last June 1, 2020, according to their apps. So try to update your Bitpay app it might solve your issue.
Also, check your devices and maybe there is something blocking your card to show on the Bitpay app it might be antivirus or any apps that preventing it Bitpay card to show.
Or maybe the app is totally corrupted and you might need to uninstall and install a new one.(Make sure you have a backup if you are going to reinstall the app.)