Hi,
Thanks for posting in Microsoft MECM Q&A forum.
May we know if you have specified an initial management point for the Configuration Manager client to use when manually installed the client? So that the client could retrive the MP from its registry key. For example:
CCMSetup.exe SMSMP=smsmp01.contoso.com or https://smsmp01.contoso.com
For more detailed information about Cross-Forest client management, please refer to:
Cross Forest Support in ConfigMgr 2012 Part 1: Simple Management
Cross Forest Support in ConfigMgr 2012 Part 2: Forest Discovery, Publishing, and Client Push Installation.
For more information about client manual installation, please refer to:
About client installation parameters and properties in Configuration Manager
Hope it helps. Have a nice day!
Best regards,
Simon
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