How to get Approval notifications after Approver user name/email ID is changed

Summary:

Hi All,

For our business, they are changing domain names and hence there email addresses are getting changed from ABC@BR.COM to ABC@BR.CO.IN

They are using email address as there user name to login.

so when we changed login names , they are not able to approval notification in their work list and when we change back to old user name-> they are able to see notifications.

so kindly help us guide, How to get Approval notifications after Approver user name/email ID is changed

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