O365 Nav Bar is always filled with black if you are an External User
Imagine you have an external user access to a SharePoint Online site, where the Office 365 Nav Bar is filled with wine-red. However, every time you visit to the site as an external user, you may see the Nav Bar as black.
This happens in all tenants w/o exception while accessing as an external user and there is no way to change the color. This is confusing and frustrating for some customers who are giving special meaning to each site collection's Nav Bar color.
Please consider and discuss about design change on this.

16 comments
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Alex commented
Not having this branded makes it even harder to share files with clients through Teams/Sharepoint because they don't recognize the file/share so they think its spam/ malware
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Anonymous commented
Microsoft, this is a must have for companies because makes our users very confuse and not being able to relate to our company.
Please work on this so we can make sure our external users will connect to our portal and get our site branded theme. -
Chris Washington commented
Mine comes up blue instead of the overwritten tenant theme.
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Oliver Krause commented
We need this! So annoying that we can't carry our Brand identity outside our organization.
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Brandon McNair commented
Add in my vote. It is very confusing for our external users.
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Hiroki Gota commented
This behaviour must be presented in all customising theme documentation until you've fixed as this is miss-leading.
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Anonymous commented
Am aghast that this is happening - we decided for a number of reasons to move from Huddle to Sharepoint and our Microsoft partner convinced us that Sharepoint is more than capable to replace Huddle, inlcuding a key requirement for our external partners (of which we have 100s) to access the site. To find the custom logo is not appearing is disappointing and if we had known this at the beginning we may not have made the move. At the very least this is now going to make the transition harder as many of our Huddle users will use this as an excuse to make things difficult. We also have had to build a special site for external users as they cannot access the Sharepoint portal which Huddle external users can.
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Maziar commented
External users should see the custom logo in the top bar for the tenant so they know where they are.
One more vote for this also! :) -
Michael Bollhoefer commented
So I am pretty sure the reason that they don't support this is that you can setup a link so that when the logo is clicked it takes you to whatever URL you specify. In most cases this is going to be the internal communication page, hub site, or application launch page. So I understand how that could be an issue. But why not just add a second option on the page where you configure the theme for the suitebar to say Guest URL or Image for Guests and then it would be handled.... ARG
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Anonymous commented
Three years later and this is not a priority? As people have said, external users needs to know that they are on another company's site -- especially if their company also uses Office 365!!
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Anonymous commented
This is an absolute must have for SaaS providers. Guest users are otherwise not clear on whose site they are accessing, and the user experience is very much unclear.
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Danny commented
Count my vote for this.
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Cas van Iersel commented
In the meantime, it's possible to customize it using the SharePoint framework on the Modern SharePoint Sites. I used a communication site for instance. I wrote up a short blog on how to get it done. https://medium.com/@casvaniersel/customize-o365-header-for-external-users-532efc8cc5d6
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Kevin commented
My communication site looks great internally, but the black bar along the top for my external users definitely takes away from the overall look of the site. Hopefully this can be fixed soon.
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Luka commented
External users should see the custom logo in the top bar for the tenant so they know where they are.
One more vote for this also! :) -
jspadeaMH commented
External users should see the custom logo in the top bar for the tenant so they know where they are.