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Hello, Can you check if your EIP is already attached to any Network Interface (like that of a NAT Gateway)? You can do this by going to your console, navigate to VPC and search for Elastic IPs option. Look for your EIP (52.5.231.106) and check the Summary section.
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Okay, so this is why you are unable to associate that EIP with your instance. You can allocate a new EIP and attach that to your instance as you cannot disassociate an Elastic IP address from a NAT gateway after it's created. To use a different Elastic IP address for your NAT gateway, you must create a new NAT gateway with the required address, update your route tables, and then delete the existing NAT gateway if it's no longer required.