Today, 15.12.2021: "online services are unreachable"

[CasualClick]

Please reference:

MSFS Online Services Outage

EDIT: Servers are back and Online Services are now available. Thank you for your patience. MSFS servers are currently experiencing issues: RENO / Multiplayer and access to the Marketplace might be impacted. The Team is working on it, we will inform you as soon as Online services are back. Thank you for your patience , MSFS Team.