Could you explain exactly what it is you are trying to do? Do you have an ICS file from something like Google Calendars that has many custom event types, and you want to import these into Team Calendar?
This is not possible but I found a few feature requests for similar things:
Please vote on the ones you are interested in and watch them in order to receive updates in the future on them.
If neither of these seem relevant, you could let me know where your .ics file originates from and what the current behavior is when you are trying to add it to Team Calendar?
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