Hi @macferse, I've had the Zostavax shingles vaccine and a few years later the Shingrix vaccine but my PMR was in remission and I was not on steroids. I think it depends on which shingles vaccine you receive - live Zostavax or non-live Shingrix vaccine.

Here's some information from Mayo Clinic on the topic
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"Talk to your health care provider about your vaccination options if you:
-- Have ever had an allergic reaction to gelatin, the antibiotic neomycin or any other component of the shingles vaccine
-- Have a weakened immune system due to HIV/AIDS or another disease that affects the immune system
-- Are receiving immune system-suppressing drugs or treatments, such as steroids, adalimumab (Humira), infliximab (Remicade), etanercept (Enbrel), radiation or chemotherapy
-- Have cancer that affects the bone marrow or lymphatic system, such as leukemia or lymphoma
-- Are pregnant or trying to become pregnant"
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Shingles vaccine: Should I get it?:
https://newsnetwork.mayoclinic.org/discussion/shingles-vaccine-should-i-get-it/
Here's an article on possible adverse effects:
-- Corticosteroids Contribute to Serious Adverse Events Following Live Attenuated Varicella Vaccination and Live Attenuated Zoster Vaccination: https://pubmed.ncbi.nlm.nih.gov/33418856/