vpn client cannot connect to windows 10 vpn host

[Microsoft Windows]

I am trying to create a remote connection to my home W10 Pro computer from my remote devices - an Android phone and a W10 Pro laptop. The laptop can connect remotely using RDP, but neither device can connect using the built-in W10 PPTP vpn. I used to be able to vpn-connect routinely with both devices, but no longer can. So, I assume my home router settings are correct as nothing has changed on the router. I wish I could tie the change to a modification in the host computer, but I was not that vigilant. Turning off the host Windows Defender firewall does not help. Any suggestions?

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