@Claudionir Queiroz da Silva - Welcome to Microsoft Q&A and thanks for reaching out to us.
This error message indicates that the resource move validation failed since the 'Microsoft.Compute/sshPublicKeys' resource type is not eligible for move to a new resource group.
Unfortunately, you will not be able to move the 'Webserver1_key' resource to a new resource group. However, you can still organize your resources by creating a new resource group and moving all other resources to it.
Hope this helps. and please feel free to reach out if you have any further questions.
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