ZDM Issues for iPad Minis

Hello, we've been having iPad Mini 5/6s ZDM migration issues lately. We've been doing it globally on several sites until we've ran into a problem. When doing the ZDM migrate the zoom app is not automatically installed to the iPad when it should have. Is there a certain limit that our team is hitting?. We've been doing loads of enrollments too. Could that be an issue that could be effecting zoom? We haven't had this problem until just now. Is there any insight to this.

We've also tried connected the device to ZDM using device management but that still doesn't help. 

Thank you