Tag not monitored by Microsoft.
The MCID (Microsoft Certification ID) was a unique identifier for the Certification Profile, which has since been retired. Your unique identifier for your Learn Profile is now your Learn Username. If you are looking for your MCID and it is not showing in your transcript, it may be because the MCID is no longer applicable. You can access your certification data through your Learn profile instead.
If you need further assistance regarding your certifications or profiles, you can contact Microsoft Credentials Support for help.
References: