How to Fix GeForce Now Error code 0xC27A0005

The error code 0xC27A0005, with a message (There was a problem starting your session. Try again), which appears when you try to launch a game on GeForce NOW, indicates a connection issue with their servers. It typically occurs when the servers are down for maintenance

Wait a few hours—up to 24 hours—and the issue should resolve itself. Maintenance on GeForce NOW involves deployment and testing to ensure reliability, but they usually do their best to keep downtime as short as possible.

While you wait you can try
Restart your Device and Router and ensure your network is stable then relaunch the game again

If it all fails and the error persists, contact their support team
https://www.nvidia.com/en-us/support/consumer/

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