Issue with publishing a new app

The Play Store console no longer accepts .apk's. I tried to upload the .aab for my new app. But, I got an error that said :

Your Android App Bundle uses an upload certificate with a key that is too weak.
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Please let me know what I sgould do?

Did you try this?

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try regenerate new aab file then upload it on a new draft app , google play generates a key automatically if you don't supply one.

i tried it 2 weeks and published app only aab works now , check your app inventor version maybe it's old one.

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