You want to enterprise enroll a device that has existing consumer accounts.

Device State: Before you can enroll a ChromeOS device into an enterprise environment, it's crucial that it's not associated with any personal Google accounts. Existing consumer accounts can interfere with the enrollment process and the application of enterprise policies.

Data Backup (Optional): If the existing consumer accounts on the device contain important data, advise the users to back up their information before proceeding.

Account Removal: Sign in to the device with each consumer account and remove the account from the device. This ensures a clean slate for the enterprise enrollment process.

Powerwash (Optional): While not strictly necessary after removing accounts, performing a powerwash (factory reset) is a recommended step. It further erases any remaining data or configurations linked to the consumer accounts, ensuring a completely fresh start for the device.

Enrollment: Once the consumer accounts are removed (and optionally, after powerwashing), follow the standard enterprise enrollment steps for your organization. This typically involves entering enterprise credentials at the login screen, or using a unique enrollment token, depending on your company's setup.