Per this documentation:
I added the ICS link into the thank you page of an On24 webinar a few weeks ago and it seemed to work where the personalized on24 URL was included in the ics file. When I went to try and create another one for a different webinar, the ICS file on the landing page has a blank area where the personalized URL is. The thank you email that includes a link to the ICS file comes up correctly, it's just the landing page link to the ICS file that doesn't contain the personalized link. Is this a lag issue or a broader bug?