There are 2 ways to play Qobuz Albums, 1) via the Roon Album Browser by selecting a Qobuz Album that you “Added to Library” or 2) via the Hamburger menu selecting Qobuz, which takes you to the Qobuz Browser, can you play anything there?
A couple of things to try, some people setup their Router to use a different DNS, I set mine to 1.1.1.1 in the Router and in my Roon Config, here’s what my browser config panel shows, which matches my router:
Also you could try disabling the Qobuz Service and re-enable it, try lowering the Streaming Quality, try Sync Library Now.
Also you could try delete the albums you “Added to Library” and then try to play them from the Roon Qobuz Browser.