Your share link should look like this:
https://aus-share.inreach.garmin.com/feed/share/joebloggs
or
https://share.garmin.com/feed/share/joebloggs
You can also use your map link e.g:
https://aus-share.inreach.garmin.com/joebloggs
or
https://share.garmin.com/joebloggs
Instructions to find your device IMEI number can be found on the Garmin website