Hello @Tony Hudziak ,
Welcome to Microsoft Q&A Platform. Thank you for reaching out & hope you are doing well.
The error message you are receiving states that you have configured the same Public IP address in your local network gateway as your Azure VPN gateway.
The local network gateway is an object that represents your on-premises location for routing purposes. The IP address that you need to configure in your local network gateway should be the public IP address of the on-premises VPN device that you want Azure VPN gateway to connect to.
If you don't have the IP address of your VPN device or you are just deploying this connection for learning purpose, you can use any random IP address but it must be different from the IP address of your VPN gateway.
Please refer the below article for more information :
https://learn.microsoft.com/en-us/azure/vpn-gateway/tutorial-site-to-site-portal#LocalNetworkGateway
Kindly let us know if the above helps or you need further assistance on this issue.
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