See the large # of other related threads... same issue [most participants of recent threads..
https://obsproject.com/forum/threads/obs-stopped-connecting-to-facebook-live-stream.183846/ ]
However, recognize there are 2 different issues
1. stream NOT connecting... often security software, browser code/certificate/cache interfering
2. Stream is connecting OBS Studio has green streaming light BUT FB /live/producer preview window not showing video ... this is a FB/Browser issue, NOTHING to do with OBS Studio
- Browser refresh (Chrome on Win10) works for us the few times it has happened to us
- FB has been screwing with (and up) /live/producer web page code for months now (and possibly stuff on the back-end as well)
we stream to FB just fine (knock on wood) using Scheduled Video event and NOT using Persistent Stream key (security measure)
Standard best practice
- connect using InCognito/InPrivate Mode when practical [takes a few seconds extra to login, saves lots of hassles]
- check/clear Browser cookies/cache as appropriate [I almost never am NOT in InCognito/InPrivate mode] .. I often clear all, but then again, I know what I'm looking at, and the implications of doing so... ymmv
Beware 3rd security software interfering with stream sessions.... this includes router/firewalls (though far less common)