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WU_E_DM_BG_ERROR_TOKEN_REQUIRED
WU_E_DM_BG_ERROR_TOKEN_REQUIRED means the security token associated with the BITS job is no longer available. This is a job-context problem, not evidence that the update server is offline.
What to check
- Determine whether logoff, account change, service restart, or a management action removed the user context while the job was active.
- Review the related BITS and Windows Update entries rather than assuming that a proxy reset will fix the job.
- Start a new update operation after the intended user or service context is available.
Microsoft: Windows Update error reference
Microsoft: Background Intelligent Transfer Service (BITS)
Microsoft: Windows Update log files
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