Additional info: Tried updating the NS through Domain Registration > Manage Domains > Manage, but clicking “Manage” only results in the page being reloaded. Issue seems simmilar to the one described here.
Yes, sorry, read too fast. Did you raise it as a Registrar ticket (instead of Account)? Usually the Registrar team seem to deal with these quite quickly.
No problem. I did indeed, but described the fact that the page was reloading, rather than the NS update, as the main point, although mentioning both (bit of a mistaken point of cause and effect on my end).
You can always update the ticket with the specific information.
Out of interest, how did you delete the domain? Just using the “Remove site from Cloudflare” button? It shouldn’t be possible to delete a domain that’s using Cloudflare Registrar using the dashboard for the reason you’ve found (although it seems a number of people have managed to do so).