The name of the security certificate is invalid or does not match the name of the site

Question

The name of the security certificate is invalid or does not match the name of the site

Answer 1

Hi there Lieven Delva

Thats a good question and thanks for using QandA platform

To resolve this issue, you may have to change your Autodiscover DNS records (internal, external, or both). However, these changes should not be taken lightly, because the Autodiscover feature may not function if DNS records are configured incorrectly. Before you change the Autodiscover DNS records, you should understand how the Outlook client tries to locate the Autodiscover service. The Outlook client tries to locate the Autodiscover service by using the following fundamental order of operations. However, the step in which the Autodiscover service is located varies from deployment to deployment. This location depends on whether there is an on-premises solution in co-existence and what the specific on-premises email environment is (for example, an on-premises Microsoft Exchange Server, an on-premises Lotus Notes, or another environment).

For detailed info follow the below URL

https://support.microsoft.com/en-us/topic/-the-name-on-the-security-certificate-is-invalid-or-does-not-match-the-name-of-the-site-error-in-outlook-in-a-dedicated-or-itar-office-365-environment-873b8392-9f5c-8a27-311b-abdc224dc118

If this helps kindly accept the answer thanks much,