How to set up mining pool using Public Pool on older Umbrel?

Hey all. I have an older model of the original Bitcoin Machine running Umbrel. I think currently, all I can update it to is 0.5.4 version. I do have Public Pool app installed and running.

However, when pointing my miner to it, it skips it to ckpool. For some reason it doesn’t accept the Public Pool one. How do I set it up? I also had port opened for the public pool but same result.

This is the stratum address I use: stratum+tcp://umbrel.local:2018
BTC Address
PW: something