Did you try using a completely new configuration? I just changed the name of my config folder, it created a new one for me, then I downloaded the PIA files as described on the GITHUB readme file, and after I restarted the docker container it started working.
I'm still having the issue, I have read through the thread and I've tried changing to Toronto and Romania but it just keeps saying the PIA API isn't working. Is anyone else still having issues too? I've been fussing with it on and off all afternoon with no resolution