Creating a calculated field using Email of a related Record

In studio, when creating a calculated field for a related record, I'm not able to select Email.

Here's the formula I'm using:

related($atc_clientsalesreps_atc_appointments,"email")

After saving that formula and Mass Updating both the parent record and related record, the calculated field returns 'Array' instead of the expected email address of the related record.

Any help would be much appreciated!

Thanks,

Alex

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