I've made more progress, Outlook pluggin now loads https://192.168.1.6/plugins/SA_Outlook/assets/icon-80.png in its default location (I removed and reinstalled the pluggin)
The pluggin app can login when I give my username, pass, client username and client secret. But it can't do anything else:
I had to move the Pluggins directory from Legacy folder and put inside the initial Public folder. Earlier setup instructions force the doc root to the Public folder. The location the pluggin is installed in by default is outside that folder.
I can reach https://192.168.1.6/plugins/SA_Outlook/assets/icon-80.png after moving it.
Working on this issue now:
This 192.168.1.6 page can’t be found
No webpage was found for the web address: https://192.168.1.6/plugins/SA_Outlook/?_host_Info=Outlook$Win32$16.02$en-US$$$$0#/compose-config