@meaton That seems to contradict the WWDC21 video "Accelerate networking with HTTP/3 and QUIC" where at 16:22 it shows this example...
// Adjust stream properties
let options = NWrotocolQUIC.Options ()
options direction = unidirectional
let connection = NWConnection(from: group, using: options)
Notice it's attempting to manually (?) extract a stream from the group (notice the "from: group" in the connection initializer).
kdubb
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I was experiencing the same issue on the Big Sur Beta. On a whim I ran a fix for a file sharing vulnerability that Apple released quite a while ago and lo and behold it worked.
The following command fixed sharing for me:
$ sudo /usr/libexec/configureLocalKDC
Related security update: https://support.apple.com/en-us/HT208317