I uploaded my app by AAB format and it got " Upload failed. To upload an Android App Bundle you must be enrolled in App Signing by Google Play."
when I tried upload by APK format, there was not a problem uploading.
this is screenshot when I uploaded my app using AAB format
Try clicking on Let Google manage and protect your app signing key and enable it
which one should I choose ?
A. Export and upload a key from a Java keystore
B. Export and upload a key (not using a Java keystore)
Ok. Open the page with the new Beta Console
I got the same issue.
Send an screenshoot
Click on opt-in
It’s strange… Are you the admin of the dev account?
yes, i am admin
So, contact Google Play. You have to have an option of let Google decide the key… I don’t know why isn’t shown for you…
Chat support is currently not available. 
Wait some minutes and try it again
they said i must upload the keystore.
but how to convert kodular keystore to jks format.
do you know how do that?
No… I don’t know it sorry 
i got the solution.
from this video : [SOLVED] How to upload and sign your app with google for unity games 64-bit (.aab) - YouTube
Can you explain how to fix it?
he is using classic version play console
follow intruction in the video that i gave above.
