HTTP 422 when trying to cancel domain transfer to Cloudflare

I initiated a domain transfer from to Cloudflare a few days ago, but am afraid the transfer domain lock was enabled at the time so I never received an email from the current registrar. Now whenever I try canceling the transfer a progress indicator is shown for a second in the UI and then disappears without further message. Inspecting the actual HTTP call it looks like it returns a 422 code with the message “Cannot cancel transfer for this domain (” embedded in the JSON response.

I thought this perhaps was due to some bad internal intermediate state, but it has persisted for a couple days. Can’t find any other similar cases here, so any ideas what’s happened here?