@George Chrysovalantis Grammatikos , For the error code "0x87d13c33" (-2016330701), it means notSupportedOperation.
https://learn.microsoft.com/en-us/graph/api/resources/intune-deviceconfig-iosupdatesinstallstatus?view=graph-rest-1.0
In General, updates will only apply to devices enrolled through Apple's Automated Device Enrollment (with ABM or ASM). Please confirm if the enrollment method of the device is ADE.
https://learn.microsoft.com/en-us/mem/intune/protect/software-updates-ios
Hope it can help.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.