Error while updating the app on google play store

Can someone please help about why this error has come while uploading an upgrade on google console

Hi @cseducator912dq, thanks for joining our community!

Do you still have the original keystore you used when publishing your app the first time? Without knowing a lot of details here, it sounds like you just need that original keystore.

Let us know how things go!

Hi Thanks for the reply.
I got the original key store from the app we uploaded first then we imported the key in the new version but still it shows the same error. Pls help, let me know if I need to share the link or aab file on email if thats the option.
The app is originally made on a non Pro account, getting the link from there we got it into Pro then uploaded first time, same process we are doing after the update and getting the keystore from the original account