Can you give us the link to the Pura Vida app from the MKStack tutorial video? You deployed it to nostrdeploy.com
Discussion
nostrdeploy currently has an issue but it's mirroed to https://npub15nk6kmz7mqtstu87dghxr3kacggjlt8ngssqm0nrmgrwxg262rrqlghw4k.nsite.lol and works there. ill also deploy the code to github.com/derekross/pv