Sending data message means that Restream is trying to connect the platform and if that message stays for too long, that means we are having issues with it.
Here are a few things you can try to solve this issue:
Please make sure you have all the necessary permissions to stream to YouTube.
If you have multiple Gmail accounts, please choose the same as your active YouTube channel! Gmail account itself doesn't mean that you have a YouTube channel associated with it.
Please make sure streaming is enabled on your YouTube account. You can check it here.
Note: It takes 24 hours to activate your YouTube account for live streaming.
Try reconnecting channel
Please try removing your YouTube channel from Restream dashboard. Then, generate a new stream key at https://www.youtube.com/live_dashboard.
Make sure to select the "Stream" option on the left-hand side of the YouTube dashboard.
The following page will provide you with the option to reset your stream key.
Once you've reset they key, go back to the Restream dashboard and try adding the YouTube channel again.
Make sure you select the YouTube Events channel.
Then choose the option to "Connect YouTube Events" and link your YouTube account.