What might be the problem if only Apple apps like garageband and imovie are being sent to devices, but not anything else?
They all seem to be throwing errors on the first attempt to install and stopping the whole queue. Then sometimes they will randomly work.
We found a similar issue to the one you describe last year, and found that this was to due to rules on our firewall at school not being configured correctly, perhaps this could help you? Have a look at the apple support site: https://support.apple.com/en-us/HT210060
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