Let's take a look and see if we can help get you back online. There are some steps we can try which may help with the issues you're seeing. When you have the chance I'd recommend starting off with the basic connectivity troubleshooting steps first to see if that helps.
If you're still getting the same Invalid Token error after that check out the platform-specific steps as well:
Let me know if it keeps giving you the same error message after that. Thanks!