Removing a Custom app from the Teams App store

so I have uploaded a custom app in the Teams app store and need to remove it.

I uploaded it via the manage-apps page of the TAC. https://admin.teams.microsoft.com/policies/manage-apps

I can't see it here though, but can see it under "Submit to app catalogue" and if I try to re-upload it then moans about it already being uploaded! I have also checked via the PowerShell command get-teamsapp and nothing is listed!

I have searched through all of the sub sections of the Apps section of the Teams client and can only see it in Submit to app catalogue!

Any ideas?