The tuition credit is non-refundable. This means you only get it if you need it to reduce your taxes owing. So, if you don’t have taxes owning, you won’t get the credit. If you only have some taxes owing, then you'll only get enough tuition credit to reduce your taxes to zero.

So can the credit then be transferred to my parents???......who do have taxes owing.

Yes. This FAQ has info on how to do this: https://turbotax.community.intuit.ca/turbotax-support/en-ca/help-article/credit/transfer-unused-tuit...

This FAQ has info on what your parent need to do: https://turbotax.community.intuit.ca/turbotax-support/en-ca/help-article/income/enter-tuition-transf...