First, it's recommended to check Microsoft Service Status page for any known interruptions or outages.
If you could access OneDrive service successfully, could you please login your OneDrive online on other browsers, and other machines for tests?
Please also log you account into OneDrive client to check whether it could work normally. If yes, you could also click "View Online" to check the OneDrive website from client.
Then try following steps:
- Clear browser’s cache
- Flush computer’s DNS cache and renew IP address via commands as the link mentions
- Use public DNS servers
- Check your computer’s "hosts" file
- If there is any anti-virus software, please disable it temporarily.
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