Error when trying to import Exchange Calendar

Hi,

I am trying to connect to a shared calendar. I have confirmed with IT and can see the calendar in my outlook. I am not sure if the issue relates to me moving to https://outlook.office365.com/owa/ in the last 3 weeks.

I have cleared the permissions. I am not sure what permissions I need to use to connec to the calendar. The calendar is shared so I do not have credentials for it. Must I use my own [email protected] and my password?

Please find the screenshots. I also see that there are 2 smtps for this email address. Not sure which I am supposed to use. I tried both. Tried without credentials and with my domain credentials