App Submission Verify Domains Request

Description
I have an app that I’m attempting to publish. When clicking Production, then App Submission I have two domains listed. One, used only in development, has a ‘Verify’ button, but upon clicking it it returns a blank confirmation code for the meta tag, and ‘Domain is not found.’ after clicking Verify.

I’ve since changed the Oauth callback url for the development app to a different domain, but still see this prompt to verify that I cannot complete.

How To Reproduce
Follow the steps above, happy to provide app details upon contact.

Hello @seannui

Thank you for reaching out in relation to Our Domain Validation process, the next steps will be sent to you via DM. Please refer to our domain validation resource: Domain Validation Explanation for any further questions you may have about the process.

Thank you.