Please support multivalue lookup columns in Customer Insights - Data segments. Currently there is a restriction:

• Multivalue lookup (PartyList). Some system lookup columns can contain multiple values. For example, the To lookup column of Email rows can contain multiple recipients. Searching multivalue lookup columns isn't supported.

Example:

Query required participants of appointments in a segment. Currently only first contact is delivered in segment for each appointment.

Related support case:

2404250050000272