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Connect-PnPOnline -UseWebLogin fails, login window disappears
I downloaded the latest version of PnP PowerShell today but have had no success with Connect-PnPOnline (no problem using Connect-SPOService). I get the dreaded error "For security reasons DTD is proh...
Have you tried amending your hosts file?
Have you tried amending your hosts file?
What is being described here where the -UseWebLogin option is used and the screen pops up for a quick flash and then disappears leaving you connected, all sounds suspiciously like you may have Integrated Windows Authentication in the mix. If IWA is configured, it'll jump in and auth for you hence the window closing quickly.
https://learn.microsoft.com/en-us/aspnet/web-api/overview/security/integrated-windows-authentication