Ad Server Accounts
The User Settings Ad Server Accounts tab lets you connect to your profiles in supported ad servers. Once you've connected, Basis securely stores your credentials so that it can create placements for your line items and automatically update delivery data from the ad server.
Basis is integrated with the leading ad server, Campaign Manager 360.
Make sure the email address you use when you add the account matches the address used by your profile in Campaign Manager 360.
User Settings - Ad Server Accounts

Campaign Manager 360 Requirements
To use Campaign Manager 360 with Basis, your Campaign Manager 360 account must allow these permissions:
- Advertiser management: modify access
- Campaigns: full access
- Placement costs: full access
- Placements: full access
- Sites: full access
See the Google documentation for more on setting Campaign Manager 360 permissions.