Cognizant — Unable to login to one cognizant

Address:

Kolkata

Hello Sir,
My name is Rahul Kumar. Candidate id[protected].
email id- [protected]@gmail.com
I got a mail from cognizant to complete my pre joining formalities. But I am unable to login to the one cognizant portal. Everytime when i am trying to login it shows me error. I have been stuck from 6 days.please help me so that I can complete my pre joining fomalities . Below is the error that is geeting displayed everytime.

Request Id: d0251d4c-fc23-408a-9a87-4f05a6d31200
Correlation Id: a86735d5-9c3b-4f51-8d50-8b033826bff0
Timestamp:[protected]T04:24:15Z
Message: AADSTS90072: User account '[protected]@gmail.com' from identity provider 'live.com' does not exist in tenant 'Cognizant' and cannot access the application 'https://onecognizantexternal.cognizant.com'(ENT_onecognizantexternal_SAML_PROD) in that tenant. The account needs to be added as an external user in the tenant first. Sign out and sign in again with a different Azure Active Directory user account.