There are 2 main reasons why players could be unable to join Emergency Bristol.
If you speculate Roblox is having issues, causing issues when joining Emergency Bristol, you can check Roblox's status on DownDetector.
However, if you encounter the following error when joining the game:
This experience is not available due to your account settings
... it means your Roblox account settings are preventing you from joining.
The only way to resolve this error is by:
9+, 13+, or 17+Please note that Emergency Bristol can only be played from the age of 9 and is rated Minimal maturity.