Internal Teams user showing as External


We are experiencing strange behavior in Teams, sometimes few internal users are showing as external user. This is mostly happening in Teams Mobile app.


Any idea pls?

10 Replies

@krishna2320 , we experience the same issue.
How does your environment look like and in what mode is teams running?

We are still in hybrid with legacy Lync 2010 (proxy also used for federation), the tenant is in Teams island mode but some users are in Teams Only mode.
Would be helpful to understand if the issue is related to our setup or not.

Same here. Didn’t have time to do extensive debug on this.
It seems it started 1-2 months ago.

Did you open a support request to Microsoft?


We are experiencing the same issue on mobile devices. Has anybody resolved this yet?

@Mark_Taratoa unfortunately I can’t help, but just report we have same issue, it looks almost random, and occur only on mobile - a long term employee and O365/ Teams user suddenly show as (External)


@Fabian76  sorry for the delayed response, it's Teams Only Mode. we are completely online no Lync/SFB servers.


@Lars Jeppesen true, it happens once in a while not in every meeting.


@francorg  i did but they couldn't find anything.


thank you!

So it seems to be a general issue not related to any special scenario we are in currently.


@krishna2320 actually not related to meetings - the contact shown on the phone as external




I experienced the same thing.  Follow this process to fix it:


  • Exit the Microsoft Teams desktop client
  • Right click on the Teams icon in your system tray
  • Click Quit
  • Launch File Explorer
  • Browse to: %appdata%\Microsoft\Teams
  • Delete all files and folders in said directory
  • Restart Microsoft Teams
  • Restart the Computer (last resort but I would try just step 7, it may be sufficient)