To update the color of the header in Office365 suite bar follow the steps below.
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Open portal.office.com
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Navigate to Office365 Admin as shown below.
NOTE: You’ll need Admin Permissions to do that.
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From the Admin Center, open the [Org settings] option (click image to enlarge)
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From the Organizational Profile tab, click Custom themes and set the logo as shown in the screen sequence below (click image to enlarge).
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Update the color of the [Navigation bar] to the desired color
- Click Save settings to save the new logo