App must be reinstalled to enable Storefront API access / Graphiql message

Hello,

i created a custom and and gave propper rights to read products from my storefront.
From this link [https://shopify.dev/apps/tools/graphiql-admin-api](https://shopify.dev/apps/tools/graphiql-admin-api```) i installed the graphiql app to my store.
Now then 2 things happend.

  1. i loaded some products from Syncee to my store, i build the query and was able to fetch the products.

Next day i deleted the products and added some from Trendsi, then suddenly i got a empty array instead of the new added products. Why?
2. I removed the graphql app and reinstalled it, since then i have this message App must be reinstalled to enable Storefront API access i removed and reinstalled it. Also i contacted the support and a update button appeared. I clicked on it but still the message and the problem persists.

Any Suggestions?