Insteon PLM configuration/startup issues

I am having issues getting started with Homeassistant on OSX. I have it installed and have logged into it but running into issues with getting it to connect to my insteon PLM (2413U).

Here’s the error I am seeing in the logs during startup:

2019-12-05 08:33:56 INFO (MainThread) [insteonplm] Connecting to PLM on tty.usbserial-A4016PP1
2019-12-05 08:33:56 WARNING (MainThread) [insteonplm] Connection failed, retry in 2 seconds: tty.usbserial-A4016PP1
2019-12-05 08:33:58 INFO (MainThread) [insteonplm] Connecting to PLM on tty.usbserial-A4016PP1
2019-12-05 08:33:58 WARNING (MainThread) [insteonplm] Connection failed, retry in 3 seconds: tty.usbserial-A4016PP1
2019-12-05 08:34:02 INFO (MainThread) [insteonplm] Connecting to PLM on tty.usbserial-A4016PP1
2019-12-05 08:34:02 WARNING (MainThread) [insteonplm] Connection failed, retry in 5 seconds: tty.usbserial-A4016PP1
2019-12-05 08:34:05 WARNING (MainThread) [homeassistant.setup] Setup of insteon is taking over 10 seconds.
2019-12-05 08:34:07 INFO (MainThread) [insteonplm] Connecting to PLM on tty.usbserial-A4016PP1
2019-12-05 08:34:07 WARNING (MainThread) [insteonplm] Connection failed, retry in 7 seconds: tty.usbserial-A4016PP1
2019-12-05 08:34:15 INFO (MainThread) [insteonplm] Connecting to PLM on tty.usbserial-A4016PP1
2019-12-05 08:34:15 WARNING (MainThread) [insteonplm] Connection failed, retry in 11 seconds: tty.usbserial-A4016PP1

And here’s what I have in the configuration.yaml:

insteon:
port: tty.usbserial-A4016PP1

I suspect I am not specifying the port correctly but I have tried tty.usbserial-A4016PP1, /dev/tty.usbserial-A4016PP1 and A4016PP1 but seem to get a similar error each time.

In case this is relevant, I am trying to migrate from Inidgo Domotics which also used the same PLM without issue so I dont have reason to think the PLM is bad.

Thanks in advance for any suggestions on next steps.

Solved this issue with correct port setting (/dev/tty.usbserial-A4016PP1 in my case), unplugging the PLM and restarting the mac.