How to create the key store/certificate for the app in MIT App Inventor.
It will get created automatically for you
Taifun
Message from google play console:
You uploaded an APK or Android App Bundle signed with a certificate that expires soon. Sign it with a certificate that has a longer validity period.
Post a screenshot from the Play Developer console.
Delete the existing key (if any).
Export the "Android App Bundle (.aab)" application once.
You need to upload the (aab) file to the Play Store, not the APK.
Since you uploaded an APK, it must be an update for an app that was published before August 2021. Provided you haven't changed the signing method, there shouldn't be any issues with the valid (old/original) keystore.
I don't know what's going on with you. But this error is related to login.
Have you previously uploaded the app to the Play Store? Or is this your first time?
Did you read my answer (post #9)?
If so, then your question should be answered.
i`m sorry