After my first ever flu vac i developed cold symptoms & mouth ulcers. a cough similar to past sarcoid symptoms also appeared . all this is gone now but wondering if i should take covid vaccine when offered.no treatment for sarcoid was ever required ?

Yes: Unclear why you developed that set of symptoms in reaction to Influenza vaccine - would need to know more..Live virus vs inactivated, parenteral vs nasal, “high dose” vs “standard”, when did symptoms develop compared to vaccine administration. Re: coronavirus vaccine. Definitely yes. With sarcoidosis (regardless of activity) you are at increased risk of severe disease

"cold symptoms" ?'s: With the pandemic still prevalent, a PCR test for Covid-19 given the symptoms described is indicated, and if the Covid vaccine is available , even if the PCR is negative, get the vaccine. Sarcoidosis is not amenable to treatment, but the risks for Covid are significant for those with prior respiratory disease, like Sarcoid.