SCCM – Multicast on client fails with error “Failed to get MCS key (Code 0x80004005)”

Problem:

Multicast during an SCCM 2012 R2 SP1 (1511 release) Task Sequence fails with error “Failed to get MCS key (Code 0x80004005)”. This error is found in the smsts.log log file on the (Windows 10 Enterprise x64 1511) client machine.

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SerializedMCSKey and SignedSerializedMCSKey registry keys are empty – SCCM

Problem:

Sometimes it’s possible that the registry keys SerializedMCSKey and SignedSerializedMCSKey in the HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SMS\MCS location are empty after a fresh installation or after reinstalling multicast.

Solution:

Patience… It took like 5 or 6 hours to get those values populated by SCCM / WDS. I’ve searched for a way to force this, but I couldn’t find anything online. I’ve tried to reboot both machines, without any luck. If you know a way to force this, please let me know.