Improved

Webhook Action: We've added a validation to prevent saving or launching Flows using the Webhook action if the domain configured in the Webhook Request Details has not yet been authorized for your account to avoid flow failures.
Multi-Value Identifier Support: We now have the ability to support an array of identifiers associated with a single contact (e.g. all_emails) in the Schema and Segment Builders. Joining tables on an array field results in a 1:many relationship between the tables. For example, if Jane Doe has 3 emails associated with their contact, any activity associated with any of these emails will be tied to Jane Doe.
Permissions: We've updated user roles to include permissions for Trait Syncing.

Fixed

Segment Copying: We fixed a bug that was occurring when copying segments where the copied segment was being properly created, but the UX was appearing not to save with an error.