Device not charging

Since yesterday my Fenix 5X Plus won't charge. I've tried everything I can think of: soft reset, hard reset, cleaning the charging contacts, multiple charging cables, different USB ports on the same computer, multiple computers, different wall chargers... There's no way to make the battery percentage go up, even though the watch changes to the charging interface when plugged. When connected to either a USB port or a wall charger the "Charge status" on the test mode changes from "Off" to "Constl", but I don't really know what that means.

Anyone has any idea how to resolve the issue, other than sending the watch back to Garmin?