Custom SNMP Library files are not being added to device.

I have around 4 remote probes which are all in the same network inside of Azure. I also have a single PRTG Core server.

Assume that they are IP'd as: X.X.0.1 (Core), X.X.0.2-5 Remote Probes

Each remote probe connects via VPN into another Subnet remotely. Assume they are IP'd as: X.X.X.1-4 for each remote probe.

I have created a custom SNMP Library file by importing the OID Files from Cradlepoint.

For 1 and only 1 remote probe, this custom SNMP library file works. The file doesn't work for any other remote probe, despite all the devices associated with them being of the same modem firmware and model type.

Detail:

Core Probe: X.X.0.1
Remote Probe 1: X.X.0.2 // VPN Subnet: X.X.X.1
Remote Probe 2: X.X.0.3 // VPN Subnet: X.X.X.2
Remote Probe 3: X.X.0.4 // VPN Subnet: X.X.X.3
Remote Probe 4: X.X.0.5 // VPN Subnet: X.X.X.4

The SNMP Custom Library is installed on the core probe. Remote Probe 1 - The custom library works on this probe The custom library doesnt work on any other remote probe.

All the devices associated with the remote probes are all the same make and model - Cradlepoint E3000's - In fact according to Cradlepoint who distribute the OID files, there is no difference between each model, so for the purpose of this post, assume the OID File is suitable for all connected devices.