Which of the below is correct?
You are a member of staff at the taxi office.
You are a member of the staff at the taxi office.
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Sign up to join this community"Member of staff" is an idiomatic term. It means you are a member of a staff of workers.
Because it is an accepted term, you don't need to add an article before 'staff'. You already have the article 'a' in "I am a member of staff".
STAFF is a plural word to talk collectively about some individuals working for an organization. It has no singular. e.g., The staff are on strike. (NOT, 'A staff is . . . ' but you can say 'a staff of workers', 'a staff of 10' etc.) Three staff, four staff, etc.
However, we can say "A member of staff".
You say "A MEMBER OF STAFF" or A STAFF MEMBER (phrase in British English) to mean a member belonging to a staff of workers'. You need not say 'a member of the staff'.