MAAs automatic hardware manipulation in the iVM may cause the office activation to fail and reset itself prompting the user to reactivate it when running a task in the customized iVM
Open a CLI session (local console or SSH) and run this command:
df-config-mgr -w ivm.fakememorysize.enable False
Then customize the profile that is showing the issue and make sure that Office is still activated. If necessary re-activate office and then rebuild the profile.