Tracker shows several seeders, but torrent shows zero seeders?

Edit: I had to enable port forwarding. I didn't realize it was required.

Note: for some reason strikethrough isn't working (otherwise, I'd apply it to the original question. Also, not sure if I should delete this post now that it is working, or leave it up in case other people have the same issue.

Does anyone know why qbittorrent would be showing 0 seeders if a tracker shows that there are several?

I am using Proton VPN and qbittorrent. The torrent file is from teamos [dot] xyz.

ProtonVPN settings:

• Split tunneling enabled > Include mode > added app: qbittorrent
• Connected to the Netherlands (Wireguard UDP)

qbitttorrent settings:

• Network Interface set to ProtonVPN

Thank you