hey its me again, i just gathered a bunch of evidence to see if we can find the root of the problem here (im pasting this from my own comment on a reddit post about the same issue, heres the link: Reddit - Dive into anything )
hey so im having the same issue and heres what i gathered about this so maybe we can find the source of the problem
youtube links used to work for me (i copy my links from youtube itself on the quest browser) and currently all my friends dont have issues with youtube links.
every youtube link i put in brings back a invalid URL error when it shouldnt because these methods work and there should be no mistakes (various methods that all failed are: copying from youtube, copying from the share window, putting the URL through NextNex, loading a video from a built in VRC YT search)
various video players do not work and give back different errors, usually video player error (those ones being the unity and AVpro players)
youtube links dont work cross platform, i tried on my steam deck but that brings back the same issues and errors as it does on my quest.
logging into vrc via quest didnt work.
i know i dont have or use any VPNs aside from adnauseum but thats a ad blocker not a VPN.
the only thing i havent tried is restarting the router, and i dont think my IP got blocked because i still have acess to all my normal google accounts on my various devices, even my quest 3S and Steam Deck LCD.
and yes, i do have “allow untrusted URL’s” on.
i know im not alone either as one of my friends on vrc has the same issue exept certain channels do work for him.
hopefully, we can find the root of the problem with this large ass reply and plenty of evidence and maybe provide a fix to people suffering through “invalid URL” errors like me.