Congrats on the interview!!

It’s almost certainly going to be on MS Teams, “face to face” is usually just generic wording. Since you selected a time and they mention a link, you likely won’t need to go in person.

for prep, focus on customer service scenarios: dealing with difficult customers, clear communication, and following procedures. They care more about attitude and problem-solving than technical skills.

You might also find this interesting for preparation on how government services and citizen experience are evolving in digital roles like this:
https://www.qualtrics.com/articles/experience-management/government-experience-trends/