After uploading the AAB file, Google Play Store gived this message: “Your Android App Bundle is signed with the wrong key. Make sure your app bundle is signed with the correct signing key and try again. Your app bundle must be signed with the fingerprint certificate”
Any idea where this comes from and how to solve it?
YES! android - I lost my .keystore file? - Stack Overflow
Use keystore explorer and create a new keystore.jks file. Then export it as a PEM file. You then need to upload that file to the Google Play store and wait a couple of days. Rebuild your app with the new keystore file and then when you upload it to google play you will no longer receive this message because your files will match.
Step 4: in the URL above explains the keystore to PEM file.
Keystore explorer can be downloaded from here: KeyStore Explorer - Download
You need to go to the Google Play Console and request a upload key reset. You find that within your app under app signing. When you click that Request Upload Key reset, this is where you will upload your PEM file created from Keystore Explorer.