Number of members (of Team) not matching Teams admin center

Hi jigga619

To provide further assistance, I need to consult our engineers about this issue. Meanwhile, I’d like to collect the screenshots about phenomenon that it shows 899 members in the Teams admin center and 885 members in the Teams client for better comparison.

Looking forward to your update, we’ll always be here for you.

Regards,

Joey

Teams admin center (Team name blacked out for obvious reasons)

Teams client (Team name blacked out for obvious reasons)

 Hi jigga619

Thanks for your screenshots.

Based on the difference between Teams client and Teams admin center, it could be the issue associate to one side displayed. Therefore, you can try to check the actual member quantity by using PowerShell. Meanwhile, it’s also useful to us in order to narrow down the issue. Kindly refer to the steps blow:

1.Open Windows PowerShell:

2.Find the MicrosoftTeams PowerShell module from the PowerShell Gallery.Run the below command: Find-Module MicrosoftTeams

3. Install MicrosoftTeams PowerShell module as an Administrator.Run the below command:Install-Module MicrosoftTeams

4. Verify the PowerShell module is installed.Run the below command:Get-Module MicrosoftTeams -ListAvailable

5. Connect Microsoft Team.Run the below command:Connect-MicrosoftTeams

6.Get the GUID of your team.Run the below command: Get-team

7.Get users of a team.Run the below command: Get-TeamUser -GroupId 2f162b0e-36d2-4e15-8ba3-ba229cecdccf -Role Owner. (“2f16..ccf” is your GUID of the team.)

(Note: you need to run individually three times for Owner/Member/Guest)

8. You need to summarize the quantity of member of three parts. If the member too much, you can copy them and paste in Excel. You will see the quantity directly there.

Besides, we'd like to verify if you added some members in team recently.

Looking forward to your update about quantity.

Regards,

Joey

I ran the above cmdlets and combined (owner + members + guest), it comes out to 899.  I know of a user that is missing from the Teams client but shows up in the Teams admin center (if that helps).  That user is also able to post in the Team. 

So the owner of the Team is trying to add this user as an additional owner (via the client), but can't find the user to add.  That's how this all started.

Hi jigga619