No table to get the response back from Mail into process model

Hi All,

we have a process model, in which we have configured mail , in which a approve and reject link are placed by customization, where the user can approve or reject from the mail itself,, this was working fine,

but from past 2 days we are able to send mail from process model, but when the user hits the link in the mail to approve or reject, the response is not caught  by process model, what can be wrong, please help us, thanks in advance

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