An important part of migrating to the cloud is transferring your Artifactory configurations, such as repositories and user/group permissions.
While the cloud migration is enabled (with the enable configuration transfer setting in the MyJFrog Cloud Portal) all of the Platform services will be down, with the exception of the JFrog Artifactory service. This allows importing all Artifactory configurations and re-registering the other services (JFrog Xray, Insight, Pipelines, etc).
Once the configuration transfer is complete, make sure to disable the transfer setting. This will ensure that all your services are back up and Artifactory is scaled up back to its full capacity.