Facebook Groups Solution "Could not Create or Schedule new live video"
If anyone is seeing this error "Could not Create or Schedule new live video. Please try re-authenticating. If you still see this error, then check permission settings on your Facebook account." when trying to create a video on a Facebook Group, please check the group's settings (Edit Settings on the Group) and add Wirecast as an approved app for that group.
Some groups still seem to function properly without this, but Facebook is rolling out a security change so I expect this to be true for all groups soon.
For 3 of 3 test pages where I (the person on our end testing) could see this error, adding Wirecast as an approved app made streaming to the group happy again.
For more details on FB's change see: https://developers.facebook.com/blog/post/2019/11/05/changes-groups-api-access/