Updated/Amended profiles e.g. Wifi and webclips are not installing on all enrolled devices. Updated profiles are installing only on devices enrolled this year (2019), any devices enrolled from 31/12/18 and before are not installing the profiles.
All devices in question are iOS and are various models/Age/iOS versions - both devices with installed profile and devices not installing profiles are a mixture of these variations, i.e. not effecting a particular type of device.
APNs certificate is up to date (renewed recently). Checking in and syncing the device through the console does not change anything, neither does choosing to install the profile manually in the device details page. Many devices not installing the profile are showing as recently seen on the console. Issue can be resolved by manually removing device management profile from device and re-enrolling but this is not a suitable large scale solution as it is effecting many hundreds of devices.
Any advise/assistance would be much appreciated. Thank you