I am having the same issue. Here is what is in my log file
16:48:11.778: ---------------------------------
16:48:11.779: [FFmpeg aac encoder: 'adv_stream_aac'] bitrate: 128, channels: 2, channel_layout: stereo
16:48:11.779:
16:48:11.780: Output 'adv_stream': 20 second delay active, preserve on disconnect is on
16:48:31.779: [rtmp stream: 'adv_stream'] Connecting to RTMP URL rtmps://rtmp-api.facebook.com:443/rtmp/...
16:48:31.783: [rtmp stream: 'adv_stream'] Binding to IPv4
16:48:31.825: [rtmp stream: 'adv_stream'] Interface: Realtek PCIe GBE Family Controller #2 (ethernet, 1000 mbps)
16:48:31.928: RTMP_Connect1, Cert verify failed: 8 (The certificate is not correctly signed by the trusted CA)
16:48:31.928: Output 'adv_stream': stopping
16:48:31.928: Output 'adv_stream': Total frames output: 0
16:48:31.928: Output 'adv_stream': Total drawn frames: 4
16:48:31.928: [rtmp stream: 'adv_stream'] Connection to rtmps://rtmp-api.facebook.com:443/rtmp/ failed: -2
16:48:31.931: ==== Streaming Stop ================================================