Enable Tax - Booking App

Hi
I am following your tutorial to assign tax but having issue.
I have booking session set to prepayment with tax exclusive.
I do not need to assign region.
My Booking category is "charters" but when I try to assign it to the Tax Category field, I only see "uncategorized". I can't manually enter "charters" in field either.
What am I missing here?
Thanks

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