Is there an admin view, system data view or something else where the OBYAccountID is listed next to the Business Unit name. e.g.
AccountID OBYAccountID BU Name 1234 0003 Test03 1234 0047 Test09
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There is not a dataview, and the only place in the UI where the AccountID (MID) is listed is in the BU switcher dropdown. AccountID is the EID (Parent/Top level) while the OYBAccountID is the Child BU MID.
You can also make a retrieve request using SOAP:
<soapenv:Body> <RetrieveRequestMsg xmlns="http://exacttarget.com/wsdl/partnerAPI"> <RetrieveRequest> <ObjectType>BusinessUnit</ObjectType> <Properties>ID</Properties> <Properties>Name</Properties> <QueryAllAccounts>true</QueryAllAccounts> </RetrieveRequest> </RetrieveRequestMsg> </soapenv:Body>
You can hover over the business units in the admin section and the url description at the bottom left of a browser will give the MID at the end of the URL something like the following as an example: ..."id=12345" in the Parent Business Unit. If you have many business units, you can increase the number of business units to view on the page as follows: 25, 50, 75 or 100