How to fix Entitlement.diagnostics.office.com Office 365 error

Are you trying to open Outlook in Office 365 and encountering an entitlement.diagnostics.office.com certificate error?

This issue may also occur when you try to create a new profile or when the Outlook client is running.

Although there may be many reasons why Outlook cannot be opened, it may also pop up when the old domain name has not been changed or the host name is wrong.

Luckily, there are solutions that can help you fix entitlement.diagnostics.office.com errors for users in your organization.

Before we move to solutions, let’s understand what diagnostic data is in Office 365.

What is diagnostic data in Office 365?

Microsoft collects diagnostic data when you use Office 365 and OneDrive to keep your apps secure and improve their performance. At the same time, it provides a more personalized experience.

The collection of certain data is critical to the proper functioning of Office 365 products. But it doesn't allow you to disable tracking entirely.

The data does not include your name, email, or any other information not related to Office 365 or OneDrive. Additionally, it does not affect your ability to use the software.

The good news is that Microsoft 365 gives you control over your Windows diagnostic data. This helps you view and check your privacy settings directly from any Office 365 application.

Feel free to read the FAQ in the Account Privacy section to learn more about Office data collection. You can then enable or disable these settings.

Also, you can visit the Microsoft support page to learn more about diagnostic data and how to access and select diagnostic data settings.

entitlement.diagnostics.office.com Errors are required diagnostic data. It checks the entitlements of the Office 365 applications you are using.

Therefore, when the certificate is missing, you will encounter errors. If you want to know how to fix Outlook certificate error, here’s how to do it.

How to get rid of certificate errors in Office?

1. Verify the certificate name

1. Select View the certificate on the Outlook security certificate error.
2. Click Issued to Name and check that the name on the certificate matches the name on the mail server.
3. If the certificate name does not match, change the name and restart Outlook.

But if the certificate has different names, you can try each hostname. If none of these are correct, obtain the correct mail server from your Internet service provider.

After successfully verifying the certificate name, the entitlement.diagnostics.office.com certificate error should no longer pop up.

2. Change the outgoing SMTP port

1. Launch the Outlook application and click the File tab.
2. Select the Information tab and click Account Settings on the right.
3. In the Account Settings window, under the Email tab, select your email account and press Change.
4. Next, click More Settings and select the Advanced tab.
5. Here, change the outgoing server (SMTP) port and press OK to save the changes.

You may encounter Outlook security certificate errors if your Internet service provider blocks the outgoing SMTP port.

So changing the server from a blocked port to a different port may help resolve this issue.

3. Use your hosting domain name as your mail server

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Hosting providers manage a large number of domains. Therefore, in the case of shared hosting, they provide the same server to users of different domains.

This means that the hosting provider does not renew the SSL certificate for each domain.

They only use domain name certificates. Therefore, it triggers the entitlement.diagnostics.office.com security alert.

Therefore, it is recommended to use the domain name of the hosting company rather than the domain name of the mail server.

Outlook Security Alert Certificate keeps popping up

Many end users in an organization receive security pop-ups with certificate warning messages when they try to open Outlook.

Invalid name error while reading security certificate after installing Exchange Server 2016.

Another error you may encounter is that the security certificate was issued by a company that you have not chosen to trust.

When you install Exchange Server 2016 into Active Directory, it also deploys a service connection point (SCP) for the Autodiscover service.

Email clients use autodiscovery to track and collect data related to exchange mailboxes and services.

Sometimes, the Autodiscover feature may stop working if the DNS records are not configured correctly. At this point you may encounter an Autodiscover certificate error on Outlook.

You can visit the Microsoft support page to learn more about the Invalid Name on Security Certificate error.

Alternatively, you can install a valid SSL certificate and check if this helps resolve the issue. You can follow our detailed tutorial on how to install the certificate and fix email certificate errors.

Another option is to try connecting your email address to a different email client. We recommend you try Mailbird, which automatically detects the outgoing server your address is using.

It supports IMAP, POP, SMTP, the most common Outlook server types. This email client service is very reliable and easy to use. If you choose this option, you will have a smooth transition.

You just get the app and log in to your email using your credentials. Mailbird provides access to powerful email filtering, scheduling options, and other similar tools to make you more efficient and organized.

⇒Get Mailbird

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