Hello, thank you for reaching out to Microsoft Q&A.
Do you have any VPN turned on?
If so, temporarily disable any active VPN connection, then open an incognito or private browsing window in your web browser, and go to the https://account.microsoft.com/devices/recoverykey link to locate your BitLocker recovery key.
If you are still having issues, connect your device to another Wi-Fi network, such as a mobile hotspot network, and then see if you can view the BitLocker Recovery key.
Let me know if you still need more help.