Just to check here, you’ve been testing the game with a Dev Build using the URL of the launch tab and logging in via Step 3 on this page? https://docs.snap.com/minis/playcanvas/quick-start#real-time-testing-with-playcanvas
Are you talking about players or your testers here?
If players, you need to make a Production build on Snapkit portal and upload a ZIP using the correct CSP rules as listed here: https://docs.snap.com/minis/playcanvas/quick-start#create-a-production-release
If testers, you can publish a PlayCanvas build to be hosted on playcanv.as via the steps here: https://developer.playcanvas.com/en/user-manual/publishing/web/playcanvas-hosting/
And use the iframeless URL for a dev build (see this answer on how to get the that URL: Playcanvas iframe inside an iframe, why? - #2 by yaustar)
What do you see when it doesn’t work? If its a dev build and you are running on Android, you can use Chrome to remote connect to the mobile device when the Mini is running and access console logs to look for errors.
See more information here and other ways to get the console logs: https://developer.playcanvas.com/en/user-manual/scripting/debugging/#debugging-on-mobile-devices