That's not how it works.
They can accommodate you by getting you what you need a different way but you can't endanger others if you cannot wear a mask.
This behavior fuels the prejudices and treatment of people who genuinely need these protections.
Abuse of protections for disabled people should not make you constantly question disabled people.
There are less instances of faking than there are genuinely disabled people and when you allow abusers to make you prejudiced, they WIN.