Remove one of two aliases?

A user have two aliases and I would like to remove one of them. Is that possible?
I think I have managed to do it before, but I am not sure.

Set-MsolDirSyncEnabled -EnableDirSync $false

Waited some Hours then...

Set-Mailbox -EmailAddresses @{remove=" "}
"WARNING: The command completed successfully but no settings of '<user name>' have been modified."

It was not possible to remove this address?
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Sajid Shaik MSystem AdminCommented:
w.jpgOFFICE 365 ADMIN contolpanel users search user properties.. select the user and delete the alias..

all the best
Shreedhar EtteTechnical ManagerCommented:
Go to Exchange Admin Console and open the User Properties to be modified then remove the email address.
Adam the 32-bit AardvarkSoftware DeveloperCommented:
@greenshoots the cmdlet you have used seems absolutely fine. The most probable cause for its failure is the additional space at the end (@{remove=" "}) or an accidental typo. Try the cmdlet without the space and if it still does not work, run
get-mailbox {mailbox identity}| select -ExpandProperty emailaddresses

Open in new window

to verify if the address is the same.

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greenshootsAuthor Commented:
I'll check that out. It's possible that it is the space at the end 😅. Have to wait for sync to stop.
greenshootsAuthor Commented:
It worked.

@Adam the 32-bit Aardvark
I can confirm that it worked with PowerShell. It was the space. 😁

I guess it also worked with the Web Gui.

Thank you so much for helping.
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