Hi,
1,Firstly, it's recommended to check the bdd.log and smsts.log on the client to see if there is any helpful information.
2,This issue may be related to Antivirus software/Firewall, please remove/disable it to have a try. Similar thread for your reference:
MDT Error Installing Application Access Denied
Thanks for your time. Have a nice day!
Best regards,
Simon
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