Cognizant Technology Solutions — Issue in Logging to one cognizant portal

Have got an internship offer via college now that I have to accept the job offer and uploading documents through the respected link sent by cognizant
for past many 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