Cognizant — Unable to login into onecognizantexternal.cognizant.com

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

AADSTS90072: User account '[protected]@outlook.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"

also
Request Id: 10ca6bd2-e9ed-492c-bd0a-00582f167800
Correlation Id: 6049f8b5-bb42-46ca-bd27-295b872794fe
Timestamp:[protected]T10:03:08Z
Message: AADSTS90072: User account '[protected]@outlook.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