When a new task email is generated for a group, it is sending 2 different emails for the users in different time zones. For example people in PST are not copied in the email sent out for EST and vice-versa.
Is this an expected behavior?
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Can you try unchecking the "Override with initiator's timezone" option in the general property tab of the process model which hosts the send email process. By doing this we are making it as a static timezone so that the process can be used across multiple timezones.
By default, the check box is deselected.