Thank you @Francisca_Chiedu for your response.
I have another question. I know that there is an issue with gmail accounts and sometimes mails drop to spam folder.(This is mentioned in the mail from gov.uk as well)
My question is; Which email address does endorsement response come from? If I know it, I will add it to my trusted contacts list. So it will not drop into spam folder.
Thank you very much in advance
Regards