The bootstrap account specified in the subscription file indicates it will expire in the next 5 minutes. To ensure proper ...

The bootstrap account specified in the subscription file indicates it will expire in the next 5 minutes. To ensure proper functioning of the Edge subscription, re-initiate the subscription from the Edge server and complete the subscription process on the Hub server  inside the organization as soon as possible. Also, make sure the clocks of all Exchange servers inside your organization and your Edge servers are synchronized.