403. That’s an error.

Your client does not have permission to get URL /api/manifest/dash/requiressl/yes/source/youtube/id/f64b969b9026c408/itag/0/ei/5UHmXLyxJo65hAeRhIvwBA/playback_host/r3---sn-aigl6nl7.googlevideo.com/mm/31%2C26/mn/sn-aigl6nl7%2Csn-25ge7nlz/ms/au%2Conr/mv/u/pl/64/hfr/all/as/fmp4_audio_clear%2Cwebm_audio_clear%2Cwebm2_audio_clear%2Cfmp4_sd_hd_clear%2Cwebm2_sd_hd_clear/mt/1558593286/fvip/6/beids/9466585/ip/2a03%3Ab0c0%3A1%3Ad0%3A%3Abda%3A1/ipbits/0/expire/1558615621/sparams/ip%2Cipbits%2Cexpire%2Crequiressl%2Csource%2Cid%2Citag%2Cei%2Cplayback_host%2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Chfr%2Cas/signature/0612AA3E2665DDC88EC712B1BC1DDE3BAE1BC398.971E75C0B615DE236F59BB69BEB73DB81A634BD1/key/yt8 from this server. That’s all we know.