Norton Live Update Failed on Windows 10

Hi everybody !

I am running Norton Security with Backup Version 22.5.5.15 on 10 PCs since 4 months without a problem.

Since yesterday Norton Live Update (manual start) does not complete... but this only on 4 Win10 PCs not on the other 6 Win7 PCs (all 64 bit)

Download updates and process updates failed to complete with error code 8920, 223...

Everything else working and I manual update virus definitions via Intelligent Updater...as told in Norton autofix popup.

Has anyone an idea ?