Managed to make connection with fresh download and reconfig.
Also used VPN, I think the fresh download was the resolution. Very odd.
I also found the below useful, for anyone else struggling with set up:
Remember to apply the below:
ttn-lw-cli use eu1.cloud.thethings.network --fetch-ca --user --overwrite
Very worth noting…
Any reference to [application-id] or [device-id] should not be confused with individual sensor App/JoinEUI or DevEUI respectively. They refer directly to the application name given in the usual online gui. And the device id that is usually autogenerated during device adoption (this can be manually filled. You can find this in the GUI or using the below 2 commands in CLI:
ttn-lw-cli applications list
ttn-lw-cli end-devices list [application-id]
Good luck any fellow CLI noobs that find this!
PS: My purpose for all this fun was changing an end device (sensor) to this: --mac-settings.desired-rx1-delay RX_DELAY_1