Thank you for getting back to me. When creating a template with Xcode, I can select a team from on creation. I can get the test app running on the iOS device. However, the problem remains with the other project. I am using Flutter to develop and I am trying to use the .xcodeproj file provided from there.

Note that I accidentally marked the previous response by eskimo as the solution. I accidentally clicked it and it appears it cannot be undone...

Was this project generated for you by that tool? Or do they publish a single project that everyone uses? I'm not sure if I understand your questions correctly, but I'll clarify what I mean. The app is orignially written in Flutter since we want it to work on platforms other than iOS as well. Flutter allows you to export / extract a .xcodeproj file so the project can be compiled by xcode. I tried running the project on a simulated device and it worked, so the file provided by Flutter seems to work.