Why is my Canada Workers Benefit Advance Payment not showing up on my tax return?

I was a full time student for 4 months, is this why it is not pulling through to my tax return?

Seniors and students

Yes. You are not eligible for the CWB if you enrolled as a full-time student at a designated educational institution for more than 13 weeks in the year unless, on December 31, you had an eligible dependant.