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Salesforce Outlook Integration Hangs for OWA Users with “This app can take some time to load”

Publish Date: Feb 27, 2026
Description

With Salesforce Service and Sales products, due to Microsoft migrating Outlook over the web domain from https://outlook.office.com to https://outlook.cloud.microsoft, Outlook Integration users can experience an issue during login where the add-in hangs with the message “This app can take some time to load” and spinning dots.

The Microsoft announcement can be found at https://learn.microsoft.com/en-us/microsoft-365/enterprise/cloud-microsoft-domain?view=o365-worldwide.

Resolution

To resolve the problem where OWA users' integration hangs, Salesforce administrators can add the https://outlook.cloud.microsoft domain to the Microsoft® Outlook® Web App Domain section on the org's "Outlook Integration and Lightning Sync" setup page to resolve the issue.

Salesforce will also release a patch in the near future to add this new domain to the page by default.  

For more information, see Outlook Integration Does Not Load in Outlook Web Access.

Knowledge Article Number

005316043

 
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Salesforce Help | Article