Je me souviens que l'année dernière, les gens ont été acceptés jusqu'en mai et juin. Si j'étais à votre place, j'accepterais mon offre de maîtrise (quelques jours avant la date limite). Si jamais vous avez des nouvelles de l'Université d'Ottawa (fingers crossed), vous pouvez toujours accepter l'offre et refuser votre place de maîtrise. Si vous avez un superviseur, je lui expliquerais votre situation. Je pense que vous perdriez probablement votre dépôt. Je vous souhaite tout le succès possible !
I went to Dal for my undergrad, and the disability accommodation seems pretty good, though I will note that I never had to use the accommodations myself and that I graduated a year before the pandemic, so their processes may have been affected. Your first step would to be to visit the accessibility centre and to speak with an advisor about what sort of accommodations that you need, and they'll help you out. You may have already looked this up, but they list some of the accommodations you can request here: https://www.dal.ca/campus_life/academic-support/accessibility/accommodations-.html
For in-class accommodations like note-taking, professors are informed by the accessibility centre and aren't made aware of who put in the request. They'll announce the need of a note taker to the class until someone signs up to do it, which usually doesn't take long as note takers get compensated by the school. The process was the same regardless of faculty.
For testing accommodations, it seems pretty easy to get them as long as you request them in advanced on the tests. A friend of mine in my program didn't have a visible disability and was able to write his exams in a different location and had extra time for them. Anecdotal of course, but he never mentioned any issues with getting his accommodations.
Hope this helped, but if anyone who did go through the accessibility centre has a different perspective then I'll defer to them.