Ical feed not working when using IP while building site

I am using an ip/~sitename url

This exact ical feed works fine from public google calendars when I have a whole domain name on the wordpress site. Is there a way to get this working until the site goes live with the real domain name?

this is the error I get

Calendar data could not be fetched. If your URL is valid and contains an iCalendar resource, this is likely the result of a temporary server error and time may resolve this issue

https://wordpress.org/plugins/all-in-one-event-calendar/