XPS 15 9500, DMC not working?

I wrote a step by step guide of what I did to make it work again. 
see my preceding “SOLVED !“ comment.
simply add two registry values.  

open an administrator level command prompt (Start →  Find Command Prompt → Right Click Command Prompt → Click Run As Administrator)

Then entering the following two commands.

REG ADD "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Store" /v OEMID /f /t REG_SZ /d DELL

REG ADD "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Store" /v StoreContentModifier /f /t REG_SZ /d "DELL_XPS"

This returns operations to normal without even requiring a reboot.

worked for me, thanks

@hodt1 @Heli_Guy @Mike Schmieg guys, can you look in your registry for the following value?

HKEY_LOCAL_MACHINE\ SOFTWARE\Screenovate\BluePhone

Do you happen to have any value there?

I looked at

c:\Users\ \AppData\Local\Dell\DellMobileConnect\scremote.core.log

That has the following errors:

[21/02/21 18:42:48.035 | tid:14312 | BluePhoneClient.App.xaml | off]: StartLogging() Starting XAML app version 3.2.0.9771, Command line: "C:\Program Files\WindowsApps\ScreenovateTechnologies.DellMobileConnect_3.2.9771.0_x64__0vhbc3ng4wbp0\app\DellMobileConnectClient.exe" /InvokerPRAID: DellMobileConnectClient /from_uwp, log level = 3, all logs=False special flag off
[21/02/21 18:42:48.074 | tid:14312 | UiCommon.OsUtils | error]: TryGetRegistryKeyString() couldn't open registry path SOFTWARE\Screenovate\BluePhone under hive HKEY_LOCAL_MACHINE
[21/02/21 18:42:48.977 | tid:14312 | UiCommon.OsUtils | error]: [21/02/21 18:42:48.977 | tid:14312 | model.PcDetailsUtil | critical]: IsSystemSupported() Running on model which isn't supported
[21/02/21 18:42:50.165 | tid:14312 | BluePhoneClient.App.xaml | warning]: OnRequestActivate() Not started
[21/02/21 18:42:52.869 | tid:14312 | logger | critical]: STOPPING INSTANCE pid=029944
[21/02/21 18:42:53.836 | tid:37800 | logger | critical]: STARTING INSTANCE pid=017272, level = 3

Did you solve the problem? I have the same problem. Fresh install didn't solve it. After updating app from Store, it won't start anymore!

Dell Mobile Connect works for me after adding the two regitry items I wrote in the earlier post.

I checked my computer's registry, don't have an entry for: Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Screenovate.

It goes from Computer\HKEY_LOCAL_MACHINE\SOFTWARE\ to Computer\HKEY_LOCAL_MACHINE\SOFTWARE\RTLSetup to Setup. See screenshot below. https://imgur.com/fQ03QsR

I second what @Mike Schmieg posted - apparently tried the solution posted by @Heli_Guy , but it didn't work for me - I have a Precision M7540.  I've set the DELL strings to both DELL_XPS and DELL_INSPRRON, but none worked so I've reverted back to version 3.0.9346 which have been working.

Hopefully Dell fixes this soon with a newer update...

I have XPS 9560 and those registry entries are in place from the begining. So adding something that is already there has no point.

The error I get is:

TryGetRegistryKeyString() couldn't open registry path SOFTWARE\Screenovate\BluePhone under hive HKEY_LOCAL_MACHINE

@BogdanBBO  

Well, I installed the drivers that Dell instructed me to and it created zero entries under HKLM\Software\Screenovate\BluePhone, so clearly something else needs to create those entries. Kudos to @VlsisFrm for spotting that one. All we need to know now is what entries DMC is looking for.

OK with my Inspiron 7791 2&1

REG ADD "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Store" /v OEMID /f /t REG_SZ /d DELL

REG ADD "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Store" /v StoreContentModifier /f /t REG_SZ /d "DELL_XPS"

Dont have those reg entries there either.