Understanding the affect

Microsoft started blocking Change Net Providers (EWS) requests in Change On-line (Microsoft 365) as of October 1, 2026. In case your group makes use of Zoho Calendar Interoperability with Change On-line, this alteration impacts how free/busy availability is retrieved whereas scheduling occasions.

To proceed viewing Change On-line customers’ availability in Zoho Calendar, replace your current Azure utility to make use of Microsoft Graph API permissions.

For extra info on configuring Change On-line interoperability, discuss with Change Settings for Interoperability.

What has modified?  

Microsoft has been transitioning Change On-line integrations from EWS to Microsoft Graph API. With this replace, Azure purposes that also rely upon EWS permissions can not retrieve Change On-line consumer availability.

Earlier, Zoho Calendar used EWS-based permissions out of your Azure utility to fetch free/busy info. Now, these availability lookups are dealt with via Microsoft Graph.

Your Zoho Calendar configuration stays unchanged. You solely must replace the API permissions in your current Azure utility.

Earlier than and after the transition  

Who must replace their setup?  

This alteration applies to organizations utilizing:

• Zoho Calendar Interoperability with Change On-line (Microsoft 365).

• OAuth 2.0 authentication.

• Azure utility registrations that also use EWS permissions.

Organizations utilizing Change Server on-premises don’t must make any modifications. Zoho Calendar helps Fundamental Authentication for on-premise Change and OAuth 2.0 for Change On-line.

To confirm your present setup:

1. Log into Zoho Calendar utilizing your main area.

2. Navigate to the Admin Console from the Person profile part.

3. Navigate to Interoperability from the left menu and select Configure within the Change possibility.

4. Go to the Change Settings tab.

5. Examine the authentication sort configured for Change On-line.

What directors must do 

Replace the prevailing Azure utility used for Calendar Interoperability.

Within the Azure portal:

1. Add Microsoft Graph → Software permission → Calendars.Learn for consumer free/busy lookups.

2. In the event you use the Embody Rooms possibility, add:

• Calendars.ReadWrite

• Place.Learn.All

• Schedule.Learn.All

• Person.Learn.All

3. Grant admin consent for the up to date permissions.

4. Take away the previous Workplace 365 Change On-line → full_access_as_app permission.

The detailed Azure permission setup and Change configuration steps can be found in Change Settings for Interoperability.

What stays unchanged?  

You do not want to create a brand new Azure utility or modify your Zoho Calendar interoperability configuration.

The next particulars stay unchanged:

In the event you’re establishing OAuth 2.0 authentication for the primary time, or must replace your Change settings, observe the configuration steps in Change Settings for Interoperability.

Just a few remaining checks

Whereas updating your Azure utility, confirm that:

• Your consumer secret is energetic and has not expired.

• Password expiration is disabled for the Change function account to keep away from service interruptions.

• Newly added rooms are included in a Microsoft 365 Rooms Checklist.

Incessantly Requested Questions

1. Why did Change On-line free/busy lookups cease working?  

Microsoft has began blocking Change Net Providers (EWS) requests in Change On-line (Microsoft 365) as a part of its transition to Microsoft Graph API. In case your Azure utility nonetheless depends on the EWS-based full_access_as_app permission, Zoho Calendar can not retrieve Change On-line customers’ free/busy info whereas scheduling conferences.

2. How do I restore Change On-line free/busy lookups in Zoho Calendar?  

Replace your current Azure utility with the required Microsoft Graph API utility permissions, beginning with Calendars.Learn for consumer free/busy lookups. In the event you use the Embody Rooms possibility, add the required room-related Graph permissions and grant admin consent. As soon as up to date, Zoho Calendar retrieves availability via Microsoft Graph. You need not create a brand new Azure utility or change your current Zoho Calendar interoperability configuration.

3. Do I must create a brand new Azure utility?  

No. You simply must replace the permissions in your current Azure utility.

4. Do I would like to vary something in Zoho Calendar?  

No. Your current Calendar Interoperability configuration stays unchanged. Solely the Azure utility’s API permissions must be up to date.

5. Is Change Server on-premise affected?  

No. This alteration applies solely to Change On-line. Change Server on-premise is just not affected.