Zendesk
From the main forum, click on Support then “Submit a Request” option on the top menu bar. Include a detailed description. You can also point it to your topic here.
Bugs like this where it’s a missing airport or mismatch or abnormalities, is best to submit to zendesk. Posting in the forum generally won’t bring those issues to the developers but it does help others on the forum to know it’s been submitted.
Information about the type of responses you will get from zendesk:
Zendesk Bug Reporting FAQ – Microsoft Flight Simulator Support