If you've recently updated Express remove your device from Express and re-add it, that usually resolves issues. If it doesn't check this FAQ https://support.garmin.com/faqSearch/en-US/faq/content/uZQHyc3C4s2S0wfUYR2QY9
Call Garmin again if you feel you still have an issue as these forums are mainly user-to-user. Don't assume problems are generic and Garmin 'must know' about them, far more often it's an issue at the user end.