Meeting SDK API Call the problem

Description : When we call the API of SDK [[MobileRTC sharedRTC] isRTCAuthorized], the result returned is nil. What is the reason?

SDK Version : 5.10.1.3038

Reproducible Steps :

Calling this method [[MobileRTC sharedRTC] isRTCAuthorized] when joining a meeting or creating a new meeting to start a meeting returns nil, but not every time and was only found once during the first installation.

Screenshots :

Device Information :

Device Type: ( iPhone 6S)

OS: (iOS 14.1)

Additional Context :
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