Manage Signatures App login problems


You are not able to log in to the Manage Signatures App, and the program shows various error notifications.


Use the links below to learn about the most common issues and recommended solutions:

Error 407: Proxy Authentication Required

When you log in to the Manage Signatures App, you get an error similar to the one below:

Error occurred during logon. Try logging in again. An error occurred while sending the request. The remote server returned an error: (407) Proxy Authentication Required.

This problem appears when the program cannot connect to the CodeTwo Email Azure Service. The connection might be blocked by your firewall or other applications.

To solve the problem, try the following:

  1. Make sure that HTTPS connections are open for the following hosts:
  • and for the FQDN of your CodeTwo geolocation. You can find it here.
  1. If you connect via a proxy server, either ensure that the proxy connection satisfies the authentication requirements, or disable this connection.

Error AADSTS50020: User account does not exist in tenant

You are not able to log in to the Manage Signatures App. The following (or similar) error is displayed:

AADSTS50020: User account '<account name>' from identity provider '<provider>' does not exist in tenant 'CodeTwo Sp. z o.o. Sp.k.' and cannot access the application '<application ID>' 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.

This error occurs if you have two Microsoft accounts with the same email address, and you used your personal Microsoft (Office 365) account to log in. You need to choose your work account instead.

To solve the problem, log in to the Manage Signatures App again, and when the Microsoft's sign-in page appears and you're asked to choose which account you want to use, select the following account type: Work or school account (Fig. 1.).

Fig. 1. The account type prompt in Office 365.