Can’t enroll device. You’ve reached the maximum number of Android enterprise devices per user. BUT ONLY have 7 devices with that user

Hello, just wondering if you can help, we are enrolling Hundreds of Android devices into AFW (Enterprise Device Owner) Mode which has a device user limit of 10 devices per user account.

we have just started enrolling using a new account (never been used in SMC) and we have reached device number 8 and now receive the below message, would you be able to offer any advice please?

Oct 1, 2020, 11:46 AM Can’t enroll device. You’ve reached the maximum number of Android enterprise devices per user. -128  Completely failed

thanks