“401 – Unsuccessful with anonymous access. Retrying with context credentials. SendResourceRequest() failed. 80190191” error in smsts.log

My SCCM 1810 task sequence I use to deploy Windows 10 via PXE boot or task sequence media seems to be taking forever to run.

If I look in the smsts.log on one of the devices, I see the following error message:

Setting Media Certificate.
CLibSMSMessageWinHttpTransport::Send: WinHttpOpenRequest - URL: DPServerFQDN:443 PROPFIND /CCMTOKENAUTH_SMS_DP_SMSPKG$/PKGID
401 - Unsuccessful with anonymous access. Retrying with context credentials.
SendResourceRequest() failed. 80190191

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