> If they tell you that you must be in the office from 9AM to 5 PM, then you aren’t exempt.
That's not correct; the difference is that failure to fulfill such a requirement is a discipline issue (which can be dealt with by discipline up to an including termination), but not a pay issue based on hours worked as it would be for a non-exempt hourly employee.
https://www.lexology.com/library/detail.aspx?g=1b7b6851-8415...