Debug my iOS opentok voice call app -- 2

I currently have this app on the app store: [login to view URL] The app is a conference calling app that allows users to join calls of multiple people and share photos and videos within the call. The app uses vonage's opentok framework. However, the app currently does not allow the calls to go through, returning a message that just says "ok" without the call actually starting. I need help to fix this issue so that the app works again. I have the full frontend and backend code for this app. Please respond to this job post with the word "boss" so that I know you read this whole description. I just need you to debug the app and then submit it to the app store once it is fixed. I have attached a video showing the problem with the app. I have also attached a video showing how the app is supposed to work. (The video called "ScreenRecording" shows how the app is supposed to work") Please watch the attached videos and in the proposal please explain to me how you will fix this. In the proposal, please explain how you will fix the problem that you see in the video so that I know I can trust you. My budget for this project is $300, so please only bid $300 or less for this project and we may negotiate later. If you bid higher I will not respond. I only pay you once I see that you have done satisfactory work; I do not do upfront payments.