Thanks for the update, @hquaemaxima! The first thing I’d recommended is isolating where the problem is happening. You can do so by using the Zoom Meeting SDK Auth Endpoint sample to generate SDK JWT, then manually entering the token to join the meeting. This will help identify if the problem you are seeing results from how you are generating the token. I’ve shared the Zoom Meeting SDK Auth Endpoint sample app below for you to look over.
Zoom Meeting SDK Auth Endpoint sample
That aside, can you please share the following information :
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Can you share if you reviewed the SDK JWT troubleshooting steps outlined here.?
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Can you clarify the role type of the user joining the meeting from your mobile phone?
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Do you happen to know how the meeting setting is configured? Do you have registration enabled?