Hi,
Thank you for coming Microsoft Q&A forum.
The error 0x800706ba means "The RPC server is unavailable".
You may try to check the following steps:
1.Make sure the firewall and firewall exceptions are configured correctly.
2.Check if you can connect to the remote machine using explorer (admin$). Example \computername\admin$.
3.Check if any security software such as anti-virus installed on this client, if any, disable them.
For more details, you may refer to:
https://www.prajwaldesai.com/troubleshooting-sccm-client-push-error-0x800706ba/
Regards,
Allen