Hello @vernl, I would like to add my welcome to Connect along with @kimh and others. I've had 2 occurrences of PMR but it's currently in remission. I still get my flu shot every year and when available I plan to get the COVID vaccine because I'm at risk by age and health conditions. There is some data about PMR being triggered by the flu vaccine but it's worth the risk for me.

"Immunization has been reported as a rare trigger for vasculitides; a recent review of 1797 adverse events (AEs) reported across three international databases found that PMR represented 9.2% of reported AEs and was more frequently associated with influenza vaccines (3).Dec 16, 2019" - Relapse of polymyalgia rheumatica following adjuvanted influenza vaccine: A case-based review:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7002008/
It sounds like your PMR is also in remission. Have you made any lifestyle changes like diet or exercise to help keep the PMR in remission?