Upload Key Mismatch for New App (Rati) – Need Step-by-Step Resolution

Hello Google Play Support,

I am facing an issue while uploading a new app to the Play Console.

Details:

First App (Already Uploaded): Hermis
New App (Issue): Rati
Status: Internal testing (trying to upload first .aab for this app)

The Issue:

When I try to upload the first .aab for Rati, I get this error:

"Your Android App Bundle is signed with the wrong key.
Your App Bundle is expected to be signed with the certificate fingerprint:
SHA1: CE:4E:C6:19:...
but the certificate used to sign the App Bundle you uploaded has fingerprint:
SHA1: 93:25:47:4C:35:..."

I used FlutterFlow to generate the .aab, and it seems FlutterFlow is not using the same key that Play Console expects.

What I Need:

How can I find or obtain the correct upload key for Rati, given that this is a new app (not Hermis), and FlutterFlow is m
anaging builds?
Please provide step-by-step instructions so I can resolve this quickly.

I want to make sure:

My first app (Hermis) remains unaffected.
I can successfully upload the new app (Rati) without further signing issues.

Thank you,
Rakesh Sahani

Details