Preparing tests... failed. Error: Failed to prepare UI Test artifacts using command "test-cloud.exe prepare" with error message: No tests would run given the current parameters, please try again. If you can't work out how to fix this issue, please contact support.
Tried upgrading Xamarin.UiTest nuget package
I have noticed the same issue on my end and have submitted an issue to app center here: https://github.com/microsoft/appcenter/issues/2562#issue-1810455671
if you downgrade back to 4.1.4 it fixes the issue.