About a week and a half back, Jerboa on the Play Store received an update that added 0.18 support and started displaying a similar message whenever you logged in, but didn't actually block using the app or posting, but certain features were not working correctly.
As of the update yesterday, Jerboa crashes unceremoniously if you happen to be previously logged in on lemmy.blahaj.zone, and prevents fresh login with the message above.
I'm a bit worried about how the Jerboa devs are handling updates ☹️
I had to downgrade to 0.0.33
Also, I'd recommend looking into installing via F-Droid instead of Google Play Store. Play Store has become rather enshittified.
The people who are working on Jerboa are by their own admission not making the app a priority right now.
Personally, I'm using Jerboa, but I plan to switch to Thunder as soon as they implement the ability to look at your own profile via the app.