@Steepz did you ever get this to work?
a.mulloni
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According to the docs, prefix matching should work. That is, if you register an experience to https://example.com it should also be triggered by any https://example.com/* URL.
However, so far I could only trigger an app clip by the *exact* URL match and did not succeed getting prefix matching to work.
Interestingly, once the app clip is locally cached (i.e. I triggered it once with the exact URL), then also prefix matching is working.