Important exception for European registrars
Most European registrars will have limitations on assigning different nameservers within the same DNS in case the new domain was active in Cloudflare before. The reason for this is because our nameservers will always respond to the old domain nameserver values instead of the new pending zone.
In such cases it is not be possible to migrate Cloudflare without contacting Cloudflare support.
Before contacting our services, please make sure that any active Cloudflare account is on the deleted state. During this period you might need to revert to the original DNS in order to avoid any downtime.
In order to delete/deactivate the zone from Cloudflare, you can login to our dashboard and click on the ‘Advanced’ link from the Overview tab and click on the ‘Delete’ button.
Once this is done, please create a ticket to support from the Old zone asking the domain to be purged. Only then Cloudflare will be able to respond to the new pending zone nameservers and allow these registrars altering the nameservers.