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Nova doesn't allow you to add compute nodes using older versions than the rest of the deployment. I think you're using Rocky on your compute node and Stein for the rest of the deployment.

On the other hand, if you were to upgrade from Rocky to Stein, nova would allow you to continue running your Rocky compute nodes until all the services are upgraded. For testing purposes, you can "hack" the Nova db, changing the minimum service version so that it would allow you to use Rocky. Ideally, you should just install Stein.

Unfortunately we haven't published the Stein MSI yet though...