From everything I've seen Section 31 is supposed to take place in the 23rd century.![]()
I don’t think we can assume that as it is a Michelle Yeoh starring vehicle and she is now in the future. I suppose they could send her back in time during the third season of Discovery (or resurrect the Prime
Version of her character) but I would assume they want her to be able to continue appear in future Discovery seasons as a guest character at least in between Section 31 seasons.