Troubleshooting Microsoft Office Online access issues

Overview

If you are unable to open, edit, or collaborate on files using Microsoft Office Online, the issue may be related to integration settings, network restrictions, or security policies within your organization's environment.

Follow the steps below to identify and resolve the issue.

Verify Microsoft Office Online integration

1. Navigate to Organization Settings.

2. Select Integrations.

3. Open the Collaboration section.

4. Confirm that Microsoft Office Online integration is enabled.

If the integration is disabled, enable it and test the affected file again.

Check network and security restrictions

Ask your IT or security team to verify that Microsoft Office Online services are not being blocked by:

• Firewall rules

• Proxy configurations

• Network security controls

• Azure security policies

• Conditional Access policies

Restrictions on Microsoft Office Online endpoints can prevent documents from opening or loading correctly.

Test using an alternate network

To determine whether the issue is network-related:

1. Connect to a different network or internet connection.

2. Alternatively, connect through a VPN using a different route.

3. Attempt to open the file again.

If the issue does not occur on the alternate network, the problem is likely caused by restrictions within the original network environment.

Whitelist Microsoft Office Online endpoints

If your IT team confirms that Microsoft Office Online traffic is being blocked, they must allow access to the required Microsoft Office Online URLs and endpoints.

After updating the allowlist, test the functionality again.

Contact support

If Microsoft Office Online integration is enabled, no network or security restrictions are identified, and the issue persists across multiple networks or VPN configurations, please raise a support ticket.

When contacting support, include:

• A description of the issue

• Any error messages or screenshots

• Browser details

• Network environment details

• Troubleshooting steps already completed

Providing this information will help the support team investigate the issue more efficiently.