The biggest change in the policy is that you need to have 50% of eligible users Google ads certified. It means you need to make your client do certification exams before bringing on the Google Ads Manager account (Earlier known as MCC).
Let’s say you have 4 employees and 20 clients linked in your Google Ads manager account. The total number is (4 + 20) 24. So you need at least 12 users Google ads certified.