Cognizant — Unable to login to one cognizant portal

Have got an offer via college now that I have to accept the job offer through the respected link sent by cognizant
for past six days its showing that
"Sorry, but we’re having trouble signing you in.

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"
Request Id: f1246146-be5d-433d-806a-4ed91b7a6300
Correlation Id: 39eef758-ea39-4fc4-b692-9bf5c296acc8
Timestamp:[protected]T03:44:59Z
Message: AADSTS90072: User account @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

im afraid i might lose the offer
Unable to login into onecognizantexternal.cognizant.com