Black Screen Issue - Meeting SDK

We are using Zoom meeting SDK version with a JWT token, So when we join or leave the call we get a black screen instead of a user video view(Customized UI). This issue is for only for few participants.
I have tried with the Secret key and access key, It did not resolve the issue. And tried running a sample SDK code and saw the same problem. I have attached the screenshot for reference.
Please do needful


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Me also facing the same issue