Hello, @Matthew Bard !
You can update the credentials of the account for Arc resource bridge using Azure CLI:
To update the credentials of the account for Arc resource bridge, run the following Azure CLI commands. Run the commands from a workstation that can access cluster configuration IP address of the Arc resource bridge locally:
az account set -s <subscription id>
az arcappliance get-credentials -n <name of the appliance> -g <resource group name>
az arcappliance update-infracredentials scvmm --kubeconfig kubeconfig