Endpoint already registered with a different token error while trying to create a new platform endpoint

I am trying to create a new Platform Endpoint at my Platform Application and receiving this error message while inputting some device tokens: "Invalid parameter: This endpoint is already registered with a different token".

Currently I've checked and the device tokens inputted were not being used by another existing platform endpoint at the same platform application. If I try to create the same Platform Endpoint at another Platform Application it works fine.