A MAUI Mac Catalyst build cannot be added to external users in test flight (beta version of XCode)

[agingo]

Problem: When we try to add a MAUI based Mac Catalyst build to external users under TestFlight we get the error "This build is using a beta version of Xcode and can’t be submitted". We followed all online recommendations including changing the version number of the application. We've tried v6 and v7 of .NET and with a clean project.

We are using
Visual Studio 2022 Mac: v17.5.6
.NET: net6.0-maccatalyst
XCode: v14.3

Has anyone received this error and how did you fix it?

[agingo]

Here's the workaround dotnet/macios#13300