Outlook asking for calendar username and password

I’m DESPERATELY trying to sync my suiteCRM calendar with outlook.

I copy and paste the publish link to internet calendars in outlook but it asks for a username and password.

Users have reported the same issue here:
https://suitecrm.com/forum/suitecrm-7-0-discussion/1042-best-calendar-for-suite-crm-plugin-share?start=15

Please someone help