Outlook mailbox title is showing as an internal ******@outlook.com address instead of the actual mailbox email

Question

Outlook mailbox title is showing as an internal ******@outlook.com address instead of the actual mailbox email

ELabs 20

Hi Support,

I’m having an issue with a mailbox I created in Outlook.

What happened:

I set up an additional mailbox using my intended email address.
Outlook created the mailbox, but the mailbox title/identity is showing as an internal address like ******@outlook.com instead of the actual email address I entered.
In the Outlook UI, this internal Outlook-generated address is what appears as the mailbox identity.

What I need help with:

I need the mailbox title/identity to display the actual email address I created, not the Outlook-generated internal address.

Impact:

This is confusing in the Outlook UI.
It affects how the mailbox is identified for calendar workflows.
It shows the generated email not the actual email and users cannot respond because they get mailerdaemon.

Thanks.

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Answer 1

EmilyS726 244.8K Independent Advisor

When you said outlook UI do you mean the outlook.com website?

are you using a third party email address as your Microsoft account alias?

if so this is normal behavior. The outlook website is not an email client app so it cannot send or receive emails on behalf of your third party email address. The email address you use is simply an alias/ username. Actual email sending and receiving is via the third party email service provider.

let me know if I understand your setup correctly.

ELabs 20 Reputation points

2026-06-26T17:20:42.3+00:00
Hello @EmilyS726 ,

Yes I mean the outlook.com website.

The additional email I created is actually an @outlook.com email address, not third-party.

I've attached a screenshot.

The problem is that this email (in the screenshot) should be showing my actual @outlook.com email

Instead it shows this, and when I send calendar invites to people they can't reply because it's the generated email.
EmilyS726 244.8K Reputation points Independent Advisor

2026-06-26T20:09:20.1733333+00:00

I see what you mean now. Thanks for clarifying.

This is actually a known issue if you started your account with a non-Microsoft domain alias first.

Since you've added the outlook.com alias, you can make the outlook.com alias the primary, that should update what's listed in your screenshot after you sign out and sign back in.

As for sending calendar, I believe you would need to remove the third party alias completely in order for it to work. I cannot test this on my own account to verify this at the moment as I've exceeded my current 7-day alias change limit. If you haven't reached such a limit, you can give it a try.
ELabs 20 Reputation points

2026-06-27T00:58:05.2133333+00:00

@EmilyS726 All noted, thank you!