Unable to Teams App in our tenant.

Hey Guys, 

Hoping you can help. So we have an app called 

MiO which is a messaging bridge app (MS Teams to Slack) for example. And we've decided not to use it. I am now trying to remove the app (which i can clearly see in the teams / apps control panel in our tenant) but when trying to remove it via powershell i get the following error: 

App doesn't exist in the tenant. App definition and tenant entitlement are missing

If i use the Get-TeamsApp cmdlet, i am able to get the app using its app id, but am not able to remove it. 

Any ideas why this might be? 

Thanks, 

Robert