The flash and few more series new episodes are not syncing

I have been using seriesguide for the past 5 or 6 years I guess. But from last month onwards I am facing a weird issue in which new episodes are not showing up for series like the flash, young sheldon and god knows what other series episodes are not syncing. can someone please help me with the same?

Welcome! At first check the usual at Help | SeriesGuide

Is there an error displayed under More at the top? Can you access (it might be blocked for whatever reason)?