Cognizant Technology Solutions — Unable to login 1c portal & unable to accept DOJ

My Doj is on Oct 22 but I am unable to login to 1C portal to accept my doj as well as to submit documents. I raised a query multiple times in c2c still this problem is not resolved.
Error says
AADSTS90072: User account from identity provider 'live.com' does not exist in tenant 'Cognizant' and cannot access the application 'https://onecognizant.cognizant.com'(onecognizant.cognizant.com_SAML_AzureAD) 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