I have a currently working work-around for the DJI / FB streaming issue. I setup a free account with Restream [ app.restream.io ] then added FB as a destination.

Then add the Restream server as the custom RTMP server, but here's the catch, because the DJI Mimo app doesn't have a stream key input field, you need to add it to your RTMP server URL as follows:

rtmp://live.restream.io/live/**yourstreamkeyhere**

Then you can authenticate to Restream and send the stream onto FB live.

You can also enter the FB Live URL into the custom RTMP server as well, however it requires you to setup the stream first using the FB Live Producer web page before it will publish, where as using it Restream just pushes it through w/o having to setup the stream first through FB Live Producer webpage.  

I have a currently working work-around for the DJI / FB streaming issue. I setup a free account with Restream [ app.restream.io ] then added FB as a destination.

Then add the Restream server as the custom RTMP server, but here's the catch, because the DJI Mimo app doesn't have a stream key input field, you need to add it to your RTMP server URL as follows:

rtmp://live.restream.io/live/**yourstreamkeyhere**

Then you can authenticate to Restream and send the stream onto FB live.

You can also enter the FB Live URL into the custom RTMP server as well, however it requires you to setup the stream first using the FB Live Producer web page before it will publish, where as using it Restream just pushes it through w/o having to setup the stream first through FB Live Producer webpage.