plugged my iphone in to my macbook air and it charges then charges
When ever I plug my iPhone XR into my Macbook air to charge it all it does is flash the charging symbol on and off repeatedly.
MacBook Air
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That is because the USB connector you have connected is not certified by Apple or is faulty. Try other USB ports on Mac
You can use the Lightning connector, USB connector, and laser etchings to identify counterfeit or uncertified Lightning accessories. Compare the images below of certified Apple accessories and counterfeit or uncertified Lightning accessories. These are only a few counterfeit products.
Identify counterfeit or uncertified Lightning connector accessories ...