Hello! I have found a bug - looks like problem with authentication routine - for some reason lib is trying to send passwords in plain format, instead of using digest, attaching debug logs from frigate, there is thread on frigate github about this issue + thread on homeassistant github.
https://github.com/blakeblackshear/frigate/discussions/18731
https://github.com/home-assistant/core/issues/119107
0-15-1-working.txt
0-16-beta3-not-working.txt