My son's tuition transfer amount to me is $1544. When I try and enter this amount on my taxes, it states his max transfer amount is $0. Am I entering this incorrectly?

The tuition transfer is non-refundable, so if neither you or your spouse/partner owe taxes, then you won't be able to use the transfered amount.

Here are some FAQs that you might find useful:

How much of my child’s or spouse’s unused tuition credits can be transferred to me?

How do I claim my tuition fees?

How do I transfer my unused tuition credits to someone else?

How do I enter tuition transferred from my spouse or child?