If it continues to appear check the connectors on the accessory and your device for damage or debris. Your charger or the lighting port is dirty.

This Accessory May Not Be Supported On Iphone In Ios 13
This accessory is not supported by this iphone headphone adapter. It happens a lot to iphone 55s66s78 and iphone x users. It is very much possible that you have come up against an error message on your iphone telling you that this accessory may not be supported. Disconnect and reconnect the accessory to see if the alert goes away. Many of these users who were using non mfi made for iphone certified cables and splitters found themselves stuck with the this accessory is not supported by this iphone message. Your ios device has a dirty or damaged connector. The recent ios update came as an unpleasant surprise for ifolks who have been using lightning to headphone connectors with their iphone 77 devices.
If the message this accessory is not supported by this iphone or ipadipod happens when connecting to a bluetooth accessory like speakers or headphones try forgetting the device and then adding it back while renaming that device something different than before if possible. It is often a common issue among iphone ipad and ipod users and it is not limited to a particular device. Charging port is damaged or some dirt is there. If you see this alert and dont have any accessories connected contact apple support. The accessory isnt supported by your device. In this video we will see how to fix this accessory may not be supported in ios 13 this accessory may not be supported on ipad this accessory is not supported by this device iphone 7 headphones.
Your iphones software is malfunctioning. If necessary gently remove the debris and clean the connectors on your device. Since that time the 3rd party lightning to headphone jack adapter i have which worked just fine before the update now eventually stops working with a message that this accessory is not supported by this iphone. The possible reasons for this error might be. Charging accessory is either damaged defective or non certified. Here are some possible reasons for why the iphone says this accessory may not be supported.
One phone charger no matter which cord was used and the other iphone kept getting the thus accessory may not be compatible messsge and stop charging. Your accessory is defective damaged or not apple certified. I updated the ios on my iphone 7 from 1021 to 103 this morning. Driving we plugged in two iphone 7s one with apple cord one with aftermarket cord to a new aftermarket accessory to charge in the cigarette lighter adapter socket. Some iphoneipad users encountered the problem while charging their port which reflects the error message this accessory may not be supported.