This token is working fine everywhere else (like in the confirmation email or reminder email). It's only not working inside ics file so i am sure something is wrong from Marketo side only.
In that case I would open a support ticket. I didn't have issues with for any of my webinars this year. I don't have an upcoming webinar scheduled, so I can't test right now (I am on limited events in ON24).
Hi Vipin Kansal and Nick,
Check with On24, I run several webinars a month and I use the same format (Screen-shot attached) and never had a problem.
ON24 had an update lately and I had an issue with the webinar id not syncing with Marketo, they reverted the code and it started working. Probably some kind of a check they can perform.
Let me know what response you got from ON24 customer support team.