Disable Security Defaults Azure
Setting up Conditional Access in new tenants requires disable security defaults Azure first. This is a setting I have been asked to cover in recent months several times. Most administrators only ever amend Conditional Access and have never implemented it for the first time so this is an unknown area unless they have been involved with the initial roll out.
How to complete: Disable Security Defaults Azure
Firstly go to Portal.Azure.Com then Search for Azure AD Conditional Access Policy or use the following link to go directly to the blade.

Secondly, click on “Create New Policy”

When creating your policy you will notice the warning at the bottom of the screenshot above “Warning at Bottom “It looks like you’re about to manage your organization’s security configurations. That’s great! You must first disable security defaults before enabling a Conditional Access policy.”
To continue Click the hyperlink in the text which displays “Disable Security Defaults”

The above screen shows the current setting.

Set this to disabled and explain why. In this demo its due to Conditional Access being on and being more customizable as per recommendations.

Follow through the prompt and click “Disable”

The image should now appear in the top right corner of Azure Page. You can now turn on your Conditional Access Policy or carry out whatever task you wish.
Additional Details: AAD Connect
If you want to find more details please visit the attached tech net article from Microsoft for more details.
Also, if you want to find more details out on how AAD Connect please check out my other blog posts. Furthermore being from a consultant in this area. Shortly, I am hoping to have numerous blog posts on the AAD Connect subject and Transformation rules.
Finally please feel free to drop a comment below or share this blog post if it has helped you.
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If the above has helped you in increase the efficiency in a mailbox migration then please let us know by leaving a comment or feel free to share the article below. If you have any errors or require more details on anything covered then please comment.