Short answer
Play’s policy page is titled Functionality, Content, and User Experience, with limited and broken functionality sections. Read which one the email names. For limited functionality, add features that work inside the app, such as accounts, saved data, offline screens or push notifications. For broken functionality, install the release build on a real device, fix crashes and blank screens, and check the back end is live during review. Then resubmit.
Rather not fix it yourself? App Fix Ticket starts with a fixed-price diagnosis, then a fixed price for the fix before any fix work.
Why Play says the app does too little, and the fix
01
The app is a website in a frame
“We do not allow apps that only have limited functionality and content.” Google Play Console Help, Functionality, Content, and User Experience (Limited Functionality)
A thin WebView wrapper that only loads your site can be rejected as limited functionality, and Play’s Spam policy separately bans showing someone else’s website in a webview without permission. Add features that work inside the app and use the phone.
02
The app shows static content
“Apps that are static without app-specific functionalities, for example, text only or PDF file apps” Google Play Console Help, Functionality, Content, and User Experience (Limited Functionality)
A text guide, a PDF or a single screen of content is named in the policy. Turn it into something people use: search, saved progress, accounts or content that updates.
03
The app crashed, froze or didn’t load
“We don’t allow apps that crash, force close, freeze, or otherwise function abnormally.” Google Play Console Help, Functionality, Content, and User Experience (Broken Functionality)
A crash on launch, a blank screen while an API is down, or a login that never returns all count as broken. Test the release build on a real device, and check the Pre-launch report and Android vitals in Play Console.
04
The back end was off during review
A paused database, an expired API key or a server that sleeps makes the app look broken to the reviewer. Keep production running and give working sign-in details if the app needs a login.
Checked against the vendor’s docs on : Play Console Help: Functionality, Content, and User Experience; Play Console Help: Spam.
Rather hand it over?
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Related: Google Play app access sign-in details · App Store Guideline 4.2 · Google Play 12 testers for 14 days · Google Play QUERY_ALL_PACKAGES