What's wrong with my macbook Air 2019 ? I can't charge it.
apple service
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Hi,
If your MacBook Air has intel processor, resetting SMC could solve the issue.
How to reset the SMC of your Mac - Apple Support
If it doesn't help, you'd better contact Apple Support or make Genius Bar reservation if your local retail AppleStore is open or find opened local Apple Authorized Service Provider to be examined your MacBook Air there.
https://www.apple.com/retail/geniusbar/
Apple - Find Locations - Location Selector