I can’t paste my calendar URL into Deltek Collaboration because I get a “No,” “Stop,” “Do not enter” icon that looks like a circle with red line through it when I hover over the box.

When you are adding an internet calendar to Deltek Collaboration and get to the “Subscribe to a calendar outside of Deltek Collaboration” popup window, you may see a “No”, “Stop”, “Do not enter” icon that looks like a circle with a red line through it.  To add your calendar, click into the “Add iCal URL” field.  You will then be able to paste your URL into this box.