Cognizant Technology Solutions — Unable to login on One Cognizant Portal

Hello all,
I am not able to login on OneCognizant Portal.
According to the details mentioned in mail, I have to upload a scanned photo and self declaration form.
I am trying to login from Internet Explorer as suggested by Cognizant HR.
Also I am not able to upload the screenshot of the same.
It is showing an error as

Sorry, but we’re having trouble signing you in.

AADSTS50105: The signed in user 'neha.shende54_gmail.com#EXT#@CognizantOnline.onmicrosoft.com' is not assigned to a role for the application 'a02131c0-2463-4b51-977f-0decd70d2056'(onecognizant.cognizant.com_SAML_AzureAD).
Also I am not able to upload the screenshot of the same.