Submitted ideas will be evaluated by our product teams for upcoming releases and will be responded to so you know where things stand. For product support, please use the community forums or contact TAC.
NOTE: All Cisco employees & Channel Partners must enter Ideas through this Ideas Portal.
Following this doc to disable the .ics will affect all Site Users. The customer hopes it can be controlled at the user level.
Customize Email Templates
https://help.webex.com/en-us/article/1k50f/Customize-Email-Templates#id_114760
------------------------------------
disable the iCalendar template format ...
------------------------------------
Why do you not want to include the ICS vCalendar file attachment?
the same request from japan customer
https://community.cisco.com/t5/-/-/td-p/4299134
Attachments Open full size