Why isn't my port forwarding working?

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How to manually set up port forwarding - Proton VPN Support

https://protonvpn.com/support/port-forwarding-manual-setup/

A guide to manually configuring port forwarding for Proton VPN on Windows, macOS, and Linux

How to manually set up port forwarding - Proton VPN Support

I am following the linked guide for protonvpn to try to get soulseek to work and the soulseek port test tool keeps on saying the port is closed. However when I run natpmpc it seems to be successful - anyone have ideas how to get it up and running?