the verification is failing

Hi,

Looks like you're dealing with a Mozilla account issue. We have direct one-to-one support for Mozilla accounts (which is different from a peer-to-peer support forum like this one).

Please submit a new ticket from this page so our support agent can assist you further.

And also make sure you re–generate the pairing code as this one got posted publicly, so never use it again for allowing any authenticators being added to it.