On this page: https://developer.garmin.com/connect-iq/core-topics/trial-apps/ there's an example manifest:
See in 1st comment, can't post here
however this example is invalid or probably more precisely misleading, because it won't work with any device that has minSdkVersion="1.3.1" (or greater), only with devices that have 2.3.0. If you add the
iq:trialMode section to the manifest you can still compile it for older devices, for example fenix3, epix, but it will fail to start in the simulator:
Another possibility is that the bug is not in the documentation and apps with iq:trialMode section in the manifest are supposed to work (without the trial feature, similar to how epix works if
iq:uses-permission id="FitContributor" is in the manifest, even though it doesn't have fit) and the bug is in the simulator (at least in fenix3, epix)