Hi @chloeminkyung I just stumbled on this post also having the same issue. I got my app to work from this information by asking ChatGPT, haha. Basically there's an Apple Service ID, along with the Team ID, Key ID and Private key. My Apple Service ID did not match the IDENTIFIER inside Apple's Certificates, Identifiers & Profiles with the Service IDs from the drop down in the top right of the page. Hope this helps!