Two things to check:

Check that the event appears in your staffing history. If the event does not appear, please check with the Tournament Organizer to make sure that the event has been successfully uploaded and that your staffing was correctly recorded.
You might have already received the maximum amount of Professor Points for the month. If you are a Basic Professor, the maximum is 10 Points. If you are a Stage 1 Professor, the maximum is 20 Points. If you are a Stage 2 Professor, the maximum is 30 Points.

If the event does appear in your history and you have not reached your max for the month, submit a support ticket at https://support.pokemon.com/hc/en-us/requests/new?ticket_form_id=360000020293, choosing Professor Program as the category and Points as the subcategory.