Same thing here - No go on any Youtube live streaming on any browser and tried ONT reset and a different router: it's at their end, and it's hella annoying!
Bigpipe Fibre also: seems to be a Fibre related issue NZ wide - sister's is doing the same after I got her to check it, she's on Bigpipe also. I'll put a feeler out to Josh at Bigpipe, see if he knows what's going on: super annoying, can't watch my Florida Eagle Nest Cam! lol.