All versions - The Marketplace tile and/or Online services are grayed out

You cannot open the Marketplace because the Marketplace tab is grayed out and/or Online Services are turned off.

To fix this issue, simply re-enter your credentials and restart Online Services.

RE-ENTER YOUR CREDENTIALS 

Re-enter your credentials to refresh your connection to Xbox Services.

ON PC

1. Open the Microsoft Store app on your computer. 
2. In the bottom left corner of the Microsoft Store, click on the library icon
3. In the top left corner, click "Get Updates" then "Update all" and wait for the updates to install.
4. Once the updates are installed, click on your profile icon in the top right corner of the screen.
5. Under your email address, click on "Sign out".
6. Reboot the computer
7. Open the Microsoft Store app.
8. Click on the icon in the top right corner, then click on Sign in.
9. Sign in with the Microsoft account you used to play Microsoft Flight Simulator.

* If the email address under your gamertag is different from the email address used to log in to the Microsoft Store app/purchase Microsoft Flight Simulator, click on "sign in with a different account" or "Switch accounts." 

ON XBOX

1. Click on your gamertag in the top right corner of the screen
2. Click Sign out
3. Press the Xbox button on your controller to open the guide.
4. Highlight the game, press the Menu button on your controller, and select Quit.
5. Restart the game.

RESTART DATA CONNECTION SERVICES

If Online Functionality is turned OFF, turn it back ON.

If Online Functionality appears to be ON already, restart the Data Connection Services manually.

• Launch Microsoft Flight Simulator
• Go to Options > General > Data
• Toggle Online Functionality, Bing Data World Graphics, Photogrammetry, Live Real-World Air Traffic, Live Weather and Multiplayer "OFF"
• Click on Apply & Save
• Toggle Online Functionality, Bing Data World Graphics, Photogrammetry, Live Real-World Air Traffic, Live Weather and Multiplayer "ON" again.
• Click on Apply & Save

Online Services automatically will also shut off when you have reached the monthly data limit. If your current Data Consumption is superior to the Data Limit you have set up:

• Turn Data Limitation OFF

or

• Increase the Data Limit (GIB)