For each standard company, define the data stewards. 

A data steward is a user in D365 FO who can send and release master data for the sending company and can receive the data for the target company.

Standard procedure

1.	Click Master data management - Setup.
2.	Click the Companies tab.
3.	Click New.
4.	In the Company accounts ID field, enter or select a value.
5.	Expand the Data stewards section.
6.	Click New.
7.	In the Data stewards field, enter or select a value.
8.	Close the page.