Working from home challenges–Remote Desktop Gateway Server does not work

The customer reported this issue
RemoteApp Disconnected.  Your computer can't connect to the Remote Desktop Gateway server.  Contact your network administrator for assistance.

from their Windows 10 v1909 laptop, connecting to a outsider vendors (OV) Windows 2016 RD Web Access box.

Before we get onto what the Outside Vendor recommended, here’s the fix I’d suggest:

Server-side fix

Set the EnforceChannelBinding registry value to 0 (zero) to ignore missing channel bindings on the Gateway server. To do this, locate the following registry subkey, and use the given specifications:

HKLM\Software\Microsoft\Windows NT\CurrentVersion\TerminalServerGateway\Config\Core

Name: EnforceChannelBinding
Value: 0 (Decimal)
Note By default, the EnforceChannelBinding value does not exist on the Gateway server. You must create this value.

Microsoft: Terminal Services client connection error 0xC000035B when you use LmCompatibility

The Outside Vendor’s IT team advised:

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