No Response when subcribe a video on custom UI

there is no response when SDK subscribe 3rd user.
It does not happen on 1st, 2nd users , but only 3rd user.

Which Windows Meeting SDK version?
Win SDK 5.5.7732.0330

To Reproduce(If applicable)
Steps to reproduce the behavior:

  1. refer to screenshot


Device (please complete the following information):

  • Device: Lenovo S2
  • OS: Win10

Additional context
We got a sdk log of repreducing this issue.
let me know if you need it.

Hi @aaronxu33, thanks for the post.

Sorry to hear you’re having issues when subscribing to videos in a custom UI implementation. When you say that there is no response on the 3rd Subscribe call, can you please clarify what you mean (e.g. a callback isn’t triggered, there is no video rendered, etc.)?


the callback isn’t triggered, there is no video rendered.

Hi @aaronxu33,

Can you please confirm which callback(s) you are using?


sorry that I gave a wrong message, we don’t implement the callback on subcribe video.
any advise for further investigate for it?

Hi @aaronxu33,

In order to determine the reason for a video subscription failing, you will need to implement the onSubscribeUserFail callback. If you can get the fail_reason parameter from this callback, we can look into what’s going wrong with your subscription.


Hi Jon,
we add the callback for video subscribe, the SDK didn’t trigger the callback.

Hi @aaronxu33,

Thanks for checking that. I also noticed that you are on an older version of the SDK. Can you please try updating to the latest version and letting me know if the issue is still present?


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