Migii JLPT for Android

I downloaded Migii app about 3-4 months back. I tended to use the app to practice for the JLPT. The app is easy to use and because it's a iOS app it is easy to carry thousands of test questions without the worry loading track of your progress. That is until I realized I am having issues logging in to Migii. I just gave my phone a fresh install of the iOs and updated to iOS 15 I use Google ID to login where I am unable to do so. Apparently after hitting the log in button I am shown a snack at menu at the top of the screen with the words "login failed"

I haven't bought the app and a lot of stuff isn't available in the free version, but the theory section is really well done and more thorough than a lot of other apps.

This app looks like it could be a good prep tool. Unfortunately it sends incessant notifications about purchase discounts despite me turning off Discount Notifications. And it’s pretty frustrating to not have a one-time purchase option offered despite the App Store details listing such a thing.

On the first practice test of N4, there’s a reading section about a broken computer screen with questions on how to fix a certain issue, however the multiple choice options did not match up with the correct answer. I checked with a Japanese person, they said not only is the correct answer not listed, the Japanese in a lot of the questions are phrased very oddly to the point where he questioned if a Japanese person made this app or not.

I like the app a lot. I don't understand why there are bars to show our progress, but they remain at 0. Is there a way to fix it? Otherwise, I really like it.