@rgg– There are a lo to of lapses in information for COVID-19 and immunology. There just hasn't been time for every illness to have been tested. But thank goodness these vaccine have come along at all!
There are hundreds and hundreds of autoimmune diseases. And it can be very difficult to decide to have the vaccine. I know that people who have autoimmune diseases can't have certain vaccines because they have live viruses. But Both the Pfizer and Moderna vaccines do not have live viruses.
"COVID-19 vaccines help our bodies develop immunity to the virus that causes COVID-19 without us having to get the illness." CDC