Save the exact error message
Expired and account not eligible need different responses. Record the code, game, attempt time and message without publishing account details.
Check conditions in order
First rule out a typing mistake, then compare the restrictions.
- Remove accidental spaces and check the code spelling.
- Confirm that the offer is for CS2 rather than another game.
- Check expiry, region and new-account requirements.
- Check previous use and any deposit condition.
When to contact site support
If the published conditions fit, give official support the message and attempt time. Do not share passwords or backup codes, and do not pay someone to manually unlock a bonus.