Cognizant Technology Solutions — Facing issue while login on one cognizant portal

Address: Chennai

I have an offer of cognizant Programmer analyst trainee post and also recieved the offer letter but fails to login on onecognizant portal as it shows this message :-

Message: AADSTS90072: User account 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

Please fix this issue asap.