403. That’s an error.
Your client does not have permission to get URL /api/manifest/hls_variant/source/yt_live_broadcast/signature/88BC19702E906A6F62C5D223149DF37ACA59C1D8.72D538CEE123DF06C187FB4508742B6E67F0997A/dover/11/playlist_type/DVR/keepalive/yes/expire/1549653495/gcr/at/itag/0/id/ovmSF0RIwTQ.0/ei/l4FdXLH_I4jwgQeflafoDA/hfr/1/sparams/ei%2Cgcr%2Cgo%2Chfr%2Cid%2Cip%2Cipbits%2Citag%2Cmaudio%2Cplaylist_type%2Cratebypass%2Crequiressl%2Csource%2Cexpire/requiressl/yes/ipbits/0/go/1/ip/2a0b%3Af4c1%3A%3A4/key/yt6/maudio/1/ratebypass/yes/file/index.m3u8
from this server. That’s all we know.