Customizable sign-on service

A system, comprising:

• one or more hardware processors of one or more computing systems of a service provider that implement:
• a plurality of interactive services for users including a first service and a second service, wherein the services are accessed using credentials of the users;
• and
• an access manager configured to perform sign-on activities for the users and provide respective credentials of the users to access the interactive services subsequent to the sign-on activities;
• wherein the one or more computing systems are configured to cause the first service to:
• receive, from the access manager, a credential of a user that has performed sign-on activities with the access manager;
• receive, from the user, an indication to access a delegated functionality provided by the second service;
• send, to the second service, one or more instructions to provide the delegated functionality for the user, wherein the one or more instructions includes the credential of the user;
• and
• wherein the one or more computing systems are configured to cause the second service to:
• provide the delegated functionality to the user based at least in part on the credential of the user, wherein the delegated functionality accesses available user information about the user.

One or more non-transitory computer-readable media comprising stored program instructions that when executed on or across one or more computing systems of a service provider cause the one or more computing systems to implement:

• a plurality of interactive services for users including a first service and a second service, wherein the services are accessed using credentials of the users;
• and
• an access manager configured to perform sign-on activities for the users and provide respective credentials of the users to access the interactive services subsequent to the sign-on activities;
• wherein the one or more computing systems are configured to cause the first service to:
• receive, from the access manager, a credential of a user that has performed sign-on activities with the access manager;
• receive, from the user, an indication to access a delegated functionality provided by the second service;
• send, to the second service, one or more instructions to provide the delegated functionality for the user, wherein the one or more instructions includes the credential of the user;
• and
• wherein the one or more computing systems are configured to cause the second service to:
• provide the delegated functionality to the user based at least in part on the credential of the user, wherein the delegated functionality accesses available user information about the user.