Please verify the Freshdesk URL. It would go by your_company_name.freshdesk.com. Your Username would be your agent email address and you would have to enter your password.
Also, if you have SSO, you would have to use your SSO credentials accordingly. Also please open your account in the browser and do the following steps:
If you continue to face any issues with login, please feel free to write to [email protected] and one of our agents would get in contact with you to assist you regarding this.