@dimskraft
Use the same command on pfSense ;)
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Your (old now) pfSEnse 2.5.1 is using (I don't recall any more) OpenVPN 2.5.2 ?
2.5.x on the client side, and 2.4.x on the server side (probably time to upgrade your docker and pfSEnse) should work.
But there is a but.
If you use mixed versions on both sides, you should really read the changelogs : https://community.openvpn.net/openvpn/wiki/ChangesInOpenvpn25, just to make sure you not using an option that changed somewhat.
Did the phone app test work ?
What about an easy bare bone setup with certs, just a user/password + no -or minimal) crypto) stuff.
That is, if you control the server side and have access to the server log file.