Thank you for asking this question in the support community. Thank you for including the output from the debug crypto ike command on the ADTRAN. Based on that debug, it appears the Cisco is not sending the sixth message of main mode. I would either check the Cisco's local-id statement or preshared password. Also, the Configuring a VPN using Main Mode in AOS has an extensive troubleshooting section, that led to my suggestions.
I hope that makes sense, but please do not hesitate to reply to this post with any additional questions or information. I will be happy to help in any way I can.
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