I filed my last TM30 end of July 2023 with the app and used the TM30 screenshot on 6.9.23 at immigration. So it seems the app is still working properly.
for me it was the other way around. I was unable to register on mobile so I used PC and my chrome browser. All went well. Confirmed email address and got password.
the landlord did all correct. He entered the "search date from to". That's the correct screenshot from the FN30 web page. A print from the Section 38 app looks better but you also need to register to get a sign in code.