I have tried to add a custom Forem instance (Forem is the software that runs on dev.to) via the dev.to proof, but I only get an error message:
None of the matched service providers could be verified. Keyoxide was not able to determine which was the correct service provider or why the verification process failed.
So I think the error is given because the instance URL does not match the dev.to URL. Am I right, or is the problem somewhere else entirely?