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I encountered this same issue.
PageUp support notes the following: "When selecting interviewers on the Interview Scheduler user interface, the system displays individual interviewers' time zones along with their email IDs. This enables the organiser to schedule interviews at appropriate times for these interviewers. The system infers this time zone from the Country and State information stored against the corresponding user records. If this information is not available in the user record, the system displays the time zone as "Unavailable". You can update the user record with the correct location details in such a scenario."
However, PageUp noted that there is not a workaround for when an interviewer lives a geographical area of a state that has a different time zone than the part of the state that PageUp defaults to when they see the "Country and State" information in the interviewer's user card.
I would love to see an option to manually override a user's timezone. Thank you for your consideration!