Microsoft Advertising is enhancing account security by implementing a Dual-ID requirement for account linking. Advertisers managing multiple accounts will need to provide two identifiers instead of one, ensuring safer linking.
For Manager account linking (CID), advertisers must include both a Manager Account Number and Manager Account ID. For standard account linking (XID), a Manager Account Number and Account Number are required.
This change, effective by the end of August, applies only to new linking requests and requires no technical changes.
The enforcement period spans from August 26 through September 22.
Read the official announcement here: AI Max for Search and Other Product News for August 2026.