O365 Calendar - Basic to Modern Authentication Upgrade

Modified on Sun, 22 Jan 2023 at 06:59 PM

As Microsoft deprecates Basic Authentication, your Office 365 account will start to use Modern Authentication when connecting to third-party applications. This has implications for your O365- connected accounts in Actionstep, primarily your Office 365 calendars.

To support this change, Actionstep has upgraded the way Microsoft Office 365 calendars are authenticated.

This article outlines what you need to know about the change and how to make it as seamless as possible for your organization.

NOTE: If you have already upgraded your calendar connection, you do not need to do this again.

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Change Summary

As Microsoft moves Office 365 to use Modern Authentication, Actionstep too must make this transition.

NOTE: See Microsoft documentation here: Deprecation of Basic Authentication in Exchange Online

The current authentication method for Microsoft calendars in Actionstep is Basic Authentication or "Basic Auth". Basic authentication accepts a username and password to authenticate your account and connect with third parties like Actionstep. Once Microsoft discontinues Basic Authentication or your account is set to only use Modern Auth, the Basic Authentication method will no longer work to authenticate your calendar.

Modern Authentication or  "Modern Auth" allows your account to limit the scope of what can be accessed when authenticating with a third party. In part, because you do not have to enter your full account access credentials, it is a more secure, modern standard that ensures you are not giving access to the parts of your account that could make you vulnerable to threats.

As not all Actionstep customers will start using Modern Authentication at the same time, Modern Authentication support has been added as a setting in your system. This setting can be enabled once your Office 365 account uses Modern Authentication.

When To Upgrade

Microsoft stated that it will “begin to permanently disable Basic Auth in all tenants, regardless of usage, with the exception of SMTP Auth.” on October 1st, 2022.


If you are using Modern Authentication for your Office 365 account, the upgrade in Actionstep is necessary to keep using your calendar.


As Microsoft upgrades more accounts, your O365 account may be changed. Similarly, you may not know which authentication method is used by your account. In both scenarios, Actionstep will display a message when it is unable to authenticate your calendar with current credentials: “There are errors on this form that need to be resolved before the data can be saved. Access Denied (401) Please check your Exchange Server password and try again.

The message refers to the password, as it is being rejected. This is because Basic authentication uses usernames and passwords to authenticate. Once your O365 account is set to modern authentication, password logins will be rejected.

WARNING: This error also displays when there are issues with a password for a calendar using Basic Authentication. If you are uncertain, please contact your O365 administrator to confirm your authentication method before making a change. 


Once you know your account uses Modern authentication, you can upgrade your Actionstep calendar settings.

How To Upgrade

To upgrade with minimal issues and interruption, it is best to ensure that every member of your organization is aware of the upgrade and the upgrade process.

NOTE: Modern Authentication must be enabled within your Microsoft system before upgrading in Actionstep. Please contact your O365 administrator if you are not sure if your are using Modern Auth or Basin Auth.

Because some accounts still use Basic Authentication, Modern Authentication support must be toggled 'on' in your Actionstep system before connecting an account that uses Modern Authentication.

NOTE: All users must follow the upgrade process steps to update their calendars. If they have multiple Outlook calendars connected to Actionstep they will need to upgrade each calendar separately. 

  1. To enable Modern authentication, open the setting menu next to your Outlook calendar and select "Upgrade Calendar" (If you do not see "Upgrade Calendar", then you do not need to take any further action).
  2.  Click "Set up now".
  3. Sign into your Microsoft account.
  4. Once you have selected your account you will be taken back to Actionstep to confirm the calendar settings.
NOTE: Settings and sharing permissions are automatically taken from your old Outlook calendar, so you do not need to edit these unless you want to change something.

Changes To Functionality


Appointments Invites

Previously upon creating an appointment, a dialog popup would ask the user whether they wanted to send an email invitation to the attendees. This option is no longer available, as this was an Actionstep feature – separate from Outlook functionality. With the implementation of Modern authentication, each attendee will be sent an invitation to the event, as this is the native functionality of Outlook.

Appointment color

Due to a limitation with the new Microsoft calendar services, color coding of individual appointments cannot be copied accross from appointments in the exchange calendar to the new modern auth calendar.

Older appointments

Due to performance limitations with syncing events with Microsoft, there is a limitation on the timeframe of appointments that are transferred. Please contact our support team if you have appointments that occur many years in the past or the future.

Any appointments older than one year are not synced across with the modern auth calendar. However, any appointments linked to data collections or matters which are older than one year will still show on matters as archived appointment. These are not live and are purely there to maintain the historic record of a matter.



Q: I have deleted my exchange calendar and connected to the modern authenticator (following your old instructions) but lost all the data collection references. What do I do? 


A: Please do not panic.

Switch off the preview flag - by going to Admin > General Settings 

Add your calendar using basic authentication 

Delete the modern auth calendar

Switch the preview flag back on

Re-add the calendar using Modern Auth

The exchange calendar can now be deleted

Q: I don't see the banner or option to upgrade a calendar? 

A. Make sure the feature flag for Microsoft Outlook Calendar Plugin with Modern Auth support is switched on by going to Admin> General Settings

If you do not see this option in your feature preview list then please contact support.

Q: I see the following error message when trying to create an appointment? 

A: If you are certain your username and password are correct and have not been recently updated then this error message means that your basic authentication has been disabled by Microsoft and you will need to use the Modern Authentication Method as described in this article.

Q: I see this error message when I go to edit my calendar.

A: Again, this error message means your Basic Authentication has been disabled by Microsoft. To continue synchronizing your calendar with Actionstep you will need to use the Modern Authentication Method as described in this article.

Q. Events from Outlook are not showing up in calendar inside Actionstep, but they can still be created in Actionstep and come through to Outlook? 

A: Please see our step by step article on :Possible Azure Admin causes for modern authentication calendar sync problems

Q. Hyperlinks in my emails are appearing as text in my appointments in Actionstep, what can I do? 

AHyperlinks added to calendar appointment descriptions in either Actionstep or Outlook will appear as plain text when the appointment is viewed in Actionstep. If you would like the hyperlink to be active, please view the appointment in Outlook. 

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