Hello
Thank you for your question and reaching out.
- Mount Window server 2019.iso as D:\
- Please try to add component from source
Add-WindowsCapability -Online -Name NetFx3~~~~ -Source D:\Sources\SxS
or
- DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs
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