Server 404 - not found - new store

I am a collaborator with a seller and they have created a new store and app for that store so as to have new access token. I cannot get the new store to work with any API call - always get a server 404 response and this json returned: {“errors”:“Not Found”}

All of my api calls work fine with their existing store. If I simply substitute the new store name and new store access token with any working api call, then it fails.

Can’t figure this one out. Any help will be appreciated.

Has the app been installed and authenticated on the new store?

server 404 means resource not found, correct?

Correct - that could also be due to the app not being installed / configured correctly on a store.