Cognizant — Not able to log in into onecognizant platform

Address: Chennai

Request Id: 2ed03fe3-d36e-406b-81b8-bf622dfe0600
Correlation Id: ca7530ed-3116-4b90-a8d7-edc42dd91e5e
Timestamp:[protected]T06:07:23Z
Message: 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

I am asked to upload documents for back ground check but I can't upload documents.