Development believes the core issue has been resolved. Please reach out to support if you continue to have difficulty.

Full error may look like this:

Unable to call My.ShipRush. HTTP/1.1 500 System.ServiceModel.ServiceActivationException. Unable to POST to "https://api.my.shiprush.com/accountservice.svc/shippingaccounts/get" (Compatible).

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We are aware of this issue and are working to resolve ASAP. No ETA yet, but we will post here when we have more.