Hi @w raspe,
Thanks very much for your sharing. I admire your ability to solve your problem. I am glad to have a short summary for the problem, we believe your sharing can help more people. It's appreciated that you could click "Accept Answer" to the reply. If there's anything else we can help in the future, feel free to post in our Q&A to discuss together.
Problem/Symptom:
Error: During the deployment process, 8 errors and 2 warnings were reported. Details: FAILURE (5624): Run DISM: /Apply-Image /ImageFile:"D:\Deploy\Operating Systems\Windows 10 Pro x64\Sources\install.wim" /Index:1 /ApplyDir.F; Litetouch deployment failed, Return Code = -2147467259 0x80004005; Failed to run the action: Install Operating System; Unkonwn error (Error: 000015F8; Source: Unknown); Failed to run the last action; Install Operating System. Execution of task sequence failed. etc...
Solution/Workaround:
Remove the OS from MDT and import it again but did it with a different name. Deployment went smooth again.
Have a good day!