apple watch isn't charging
My apple watch 6 does not charge. i checked both surfaces, and they are clean, i am using the original charger, all contacts are perfect. When i put it on the charger, the red thunderbolt symbol changes to the green, but the charging doesn't start. Moreover, when i tried to shut off or restart the watch according to the instructions, nothing happens at all. please help!
Apple Watch Series 6, watchOS 8