wearing a mask can not be enforced. BUT you could lose a job over it.
My family members, working in the hospital, was told vaccine for flu, mandatory or lose your job. That was 7 years ago. The doctors fought the issue. Finally the hospital was quieted, and said nothing more about it, 2 years later. The hospital (Banner) also pushed the issue: Vaccine for flu IF you are a first time employee. The state of AZ continues to have in law,: 3 reasons not to have vaccines, religious, medical, and philosophical.