Same situation here. Crashes reported to Analytics is zeroed out since Nov 18th and nothing in Xcode Organizer. This will be a major problem shipping new updates if not addressed soon.
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In our case, we collect a user name before joining the session and send a small message through SharePlay to "dox" the participant ID with a real name (that can be used in UI). From my knowledge, identity date is not shared thorugh SharePlay and the participant IDs are essentially a way of addressing without disclosing any identifying information about the participants.