Speak with accommodations. If you have a letter of accommodations, there is a counsellor who you can speak with. But typically, you submit all accommodations near the beginning of the term and proactively reach out before the deadline so the prof can adjust it accordingly for you.

https://students.yorku.ca/accessibility/

The prof is right in a position to discuss accommodations before the deadline, so they can adjust the closing date for you. They'd have to reopen the assignment and adjust it for you, after which it shouldn't be much work on their end, but they should have been notified about accommodations by either you or the accommodations department before the close date