It may be that the other party is having a voice or video chat with someone else, so a busy window will pop up. It may also be that the other party's network environment is poor and it is unable to receive the video call request, or the other party is on a phone call, and the priority of the phone call is higher than that of the vibrato video call, so it will not get through.

Demonstration model: iPhone12&; & Huawei P40 &；; & Xiaomi 1 1 system version: IOs14.4&; & ampemui 1 1 & amp； & miui12.0.7 app version: Tik Tok v 17.3.0 It may be that the other party is having a voice or video chat with others, so the pop-up window of the other party will be displayed, or it may be that the other party's network environment is poor, so it is impossible to receive the video call request, or the other party is on a call, and the phone priority is higher than the video call, so it cannot be connected.