The action 'Approve Submit' has been performed successfully why is not received

Summary:

Hello All,
When the approver approves the quote through email, but the approver does not receive any notification from the CPQ as

The action 'Approve Submit' has been performed successfully

or any system generated error message.
and also the quote is not approved but when the approver approves the quote through the transaction, he can approve the quote
How to fix this

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