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I have TM4C1294GXL connected launchpad with mac address 00:1A:B6:02:A8:3A while making an Id on exosite and entering this Mac address following is displayed "You have attempted to add a MACYou have attempted to add a MAC Address that is not available.

You have attempted to add a MAC Address that is not available for this device. Please verify that your number is correct and that you or someone else has not already registered this device. If the problem persists, please use the Feedback system to report this issue and we will work to resolve it with you. please help me.