How to subscribe to Internet .ics calender with Outlook on Mac

I have MS Office 356 for Mac, Outlook 16.22.1. The email part is working OK. I am now trying to subscribe to calendars, but am not able to figure it out.

Using the usual mechanism of inviting someone from Outlook on Windows which emails the Mac user the webcals link, then trying to open that in Outlook on the Mac, results in the message, “There is no application set to open the URL webcals://mydom.org/calendars/mycalendar.ics”.

On the Calendar “tab”, ‘ Open Shared Calendar’ is grayed out.

So, how do you do this on Mac (High Sierra 10.13.6)?

How can I add color to events in the .ics Google Calendar files?

As of now, I managed to create an .ics file from a text file that has my work schedule, now the issue is that I would like to distinguish morning and night shifts with colors.

It’s possible in the site itself, but it’s a daunting task to change them all manually, so, if there is a line i can insert programmatically, I would include it to be written in my autoit script.

Is there such a line?