It may be linked to another account.
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Re: M5stack core doesn't work online: ""No permission. The device has been bound!""
It may be linked to another account.
In the linked account, press Unbind in the EzData item. 
Re: M5stack core doesn't work online: ""No permission. The device has been bound!""
It may be linked to another account.
In the linked account, press Unbind in the EzData item.