I saw a post by King that they have been having problems since 3/16/2022. They are trying to fix it. I also lost 200 lives in the beginning of this week. Sucks.
I get the error message when I play in Chrome. I used Firefox so I am able to play but cannot get app store. King did post that they are working on the problem still... so don't delete app. Try playing in another browser.
I have been having the same problem for a few days now. I am playing on my desktop. First I couldn't get into the game at all. A big orange screen would come up with a monster stating technical difficulties. After I was able to get in, I lost almost 300 lives I had saved. Now I can play but not able to go to app store.