I uploaded my application with the same sign key for 4 years. But last week I wanted to convert apk to aab and I selected aab(app bundle format) And then I don't use my sign key, I tried to upload and I saw: "You uploaded an APK that is not signed with the upload certificate. You must use the same certificate. The upload certificate has fingerprint: SHA1: 2C:6A:........ and the certificate used to sign the APK that you uploaded has fingerprint: SHA1: B5:40:.........."
Anymore I can not upload either apk not aab because of this key problem.
How can solve this issue?