Google has published a new help page outlining a mandatory transition from personal to business email accounts in Google Ads. The change, aimed at improving security and access control, was first announced in April 2024.
Admins can now request users to switch, with a 30-day grace period before personal email access is revoked.

To see the complete steps, check out the official help page here: Switch Google Ads user accounts and account settings to a business email.