I've been facing this issue for a while now.
Google Play failed to upload artefacts. The Android App Bundle was signed with the wrong key. Found: SHA1: XX:XX:XX:XX. Expected YY:YY:YY:YY
I've followed all the steps mentioned in the flutterflow docs and still the issue persists.
Steps I've taken, created a fresh project, created a fresh google console service key and uploaded the key to the newly created project. I've reset the upload certificate in google play console. Used the new keystore file in advanced settings in Mobile Deployment Google Play store settings in Flutterflow.
Problem faced: Even with advanced settings, flutterflow is still generating a new key for every build and completely ignores the uploaded keystore file.
Please help resolving this issue.