We Couldn’t Save Your Changes

We couldn't save your changes Office 365

When making a change to Office 365 objects, you may sometimes see the non-informative error message “We couldn’t save your changes. Please try again”.

One example is when using the Microsoft 365 Admin Center to add a new mail address to a shared mailbox:

We couldn't save your changes

This nonsense error is caused by certain attributes being authoritative in your local Active Directory.

(you can ‘try again’ all you want 😂)

But to solve this problem, you need to add the new email address via the proxyAddresses attribute in your local AD.

How to Correct This Error

Fixing this error can be done in different ways.

By far, the easiest way is to use Easy365Manager. With Easy365Manager, you can manage proxyAddresses as an integrated part of user properties in Active Directory:

How to edit proxyAddresses using AD Users & Computers with Easy365Manager

Easy365Manager will ensure that you enter the correct format and that the address added is unique in your organization.

You can also edit the proxyAddresses attribute directly via the Attributes tab in user properties. However, there is no sanity check of values entered in this case, which can cause hard-to-troubleshoot errors.

A third alternative to edit the proxyAddresses is to use an on-premises Exchange Server. On-premises Exchange provides the same sanity check as Easy365Manager, but the downside is the indirect cost associated with on-premises Exchange:

  • Windows operating system license (Exchange license is free)
  • Windows, Exchange, and third-party software patch management
  • Antivirus management (potential 3rd party software licenses needed)
  • Backup and monitoring (potential 3rd party software licenses needed)
  • High complexity and time consuming to manage and troubleshoot
  • Huge attack surface (hundreds of thousands of companies were affected by the Hafnium zero-day exploit during 2021).

Compared to this, Easy365Manager is a simple dll extension to Active Directory Users & Computers that costs a fraction of the accumulated costs of having an on-premises Exchange Server.


Managing a hybrid Office 365 environment offers a lot of complexity and challenges.

The fact that certain attributes are authoritative in your on-premises Active Directory while others are managed in Office 365 can be very confusing at times.

With Easy365Manager, you no longer need to speculate about attribute authority as everything is managed in the familiar interface of AD Users & Computers.

Easy365Manager introduces two new tabs to user properties that let you manage Office 365 licenses and mailboxes directly from AD user properties.

You can see a list of features here.

Easy365Manager is available as a fully functional 30-day trial. Download the trial here, and you’ll be up and running in just a few minutes.