Based on the backtrace in your latest log output it’s clear that satnogs-client is installed in an outdated version (pre-version 1.1, compare satnogs-client@1.1:settings.py#L74 vs satnogs-client@1.0:settings.py#L70).
The current stable version of satnogs-client is 1.1.2 (source: [1]).
With satnogs-client 1.1 the meaning of SATNOGS_ROT_PORT was changed, thus a Configuration update for rotator stations with satnogs-client 1.1 is required.
Please update your station and keep your previous configuration from your post#7, this looks ok.
In case of further errors, please also post the output generated by Advanced->Support from satnogs-setup.
Sincerely,
kerel