You want to set up a hybrid deployment between your on-premises Microsoft Exchange Server organization and Exchange Online in Microsoft Office 365. However, when you run the Hybrid Configuration wizard, you receive an "An error occurred accessing Windows Live. The request failed with HTTP status 403: Forbidden" error message. The full text of the message resembles the following:
ERROR:Updating hybrid configuration failed with error 'Subtask Configure execution failed: Creating Organization Relationships.
Execution of the Set-FederatedOrganizationIdentifier cmdlet had thrown an exception. This may indicate invalid parameters in your Hybrid Configuration settings.
An error occurred while attempting to provision Exchange to the Partner STS. Detailed Information ""An error occurred accessing Windows Live. Detailed information: ""The request failed with HTTP status 403: Forbidden.""."".
Microsoft.Exchange.Management.Hybrid.RemotePowershellSession.RunCommand(String cmdlet, Dictionary`2 parameters, Boolean ignoreNotFoundErrors)