Hi ,
I would recommend login in with a local account and do a Reset before you enroll with AutoPilot.
If you take the Reset options :
Full wipe -> only remove my files
it will take you about 20-30 minutes to reset a device (depending on the form factor of course).
If you take the options
Full wipe - > remove everything
it will zero out the disk and it will take you hours to reset.
If the reset does not remove the bloatware , you can also try a "Fresh Install". But I think you will have to do a reset again after the "fresh install" because it keeps your information. (I haven't used the "Fresh install" option much).
You can also ask your manufacturer to deliver devices with a "clean" Windows 10.
Another option would be to launch a powershell script to uninstall all the bloatware apps silently. (takes management effort and follow-up when something changes)
