can't get backups to PBS working over pfsense wireguard tunnel

I have 2 PVE hosts and one PBS host.

PVE A is located at the same location as PBS and works fine.
PVE B is at a second location and backups seem to get stuck at 0% and never progress.

Both sites are running pfsense firewalls.

I have a wireguard site-to-site tunnel between each.

MTU & MSS on both pfSense wireguard interfaces is set to 1420. I've tried 1200 as well with the same results.

I was able to add PBS datastore to PVE B without any issues but when I try to backup it gets to...

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