To resolve the issue of not being able to access the internet after connecting your Nigeria SIM card to an educational bundle with ExpressVPN, follow these detailed steps:

1. Verify Internet Connection: Before connecting to ExpressVPN, ensure that your mobile data is enabled, and that you're getting internet access from your educational bundle. Open a web browser or an app to check if the internet is functioning without the VPN.

2. Restart Your Device: Sometimes, simply restarting your Android device can resolve connectivity issues.

3. Update ExpressVPN: Ensure that you are using the latest version of ExpressVPN. Outdated software can often lead to connection problems. Update the app if necessary.

4. Change VPN Server Location: If you are connected to a specific VPN server, try switching to a different server location within ExpressVPN. Some servers might be more congested or down - learn more.

5. Modify VPN Protocol: Within the ExpressVPN settings, you can change your VPN protocol. Switch from the default to one of the other options available (e.g., L2TP, IKEv2, or OpenVPN) to see if this resolves your issue.

6. Disable Kill Switch: If you have the “Kill Switch” feature enabled in ExpressVPN, try turning it off. This may help in restoring your internet connection - learn more.

7. Check APN Settings: Ensure that your Access Point Name (APN) settings are correctly configured for the educational bundle you are using. Incorrect APN settings can lead to internet accessibility issues. Contact your service provider for correct settings if unsure.

8. Clear Cache and Data: Go to your device's settings, find the ExpressVPN app, and clear its cache and data. This can sometimes help reset any misconfigurations.

9. Try Different Connection: If your educational bundle is still giving issues, attempt to connect to a different Wi-Fi or mobile network to see if the problem persists outside the educational context.

10. Contact Support: If none of the above steps work, it’s advisable to reach out to ExpressVPN customer support. They can provide tailored troubleshooting based on your specific situation which often includes checking your account settings or further network troubleshooting - learn more.

By following these steps, you should be able to diagnose and potentially fix your internet access issues when connected to your educational bundle through the Nigeria SIM card.