Inactive Taskbar Ignores Colour setting

Using Dark Mode colour scheme and discovered that the Taskbar is WHITE for some apps. Very irritating if you are browsing an all dark screen! Time for some tweaking (as always with Windows).

Went to Personalisation. Enabled "Show Accent Colour on Titlebar and Window borders".
Then selected a teal shade that I like for the Taskbar colour.

This improved the situation but I made a strange discovery.
With "Show Accent Colour on Titlebar..." enabled, there is no longer a white inactive titlebar.
The titlebar is now given a RANDOM (ish) shade that I don't seem to be able to control

• My teal active titlebar gave an olive coloured inactive bar.
• I had not specified olive ANYWHERE. Window seem to think that it's a good match with teal...?!
• If I change the Active taskbar colour to something else, the inactive colour gets randomly changed. For example an Orange active taskbar gave blue inactive taskbar.

Googled some more and was pointed in the direction of a Registry node called
Computer\HKEY_CURRENT_USER\Software\Microsoft\Windows\DWM precisely AccentColorInactive
I set this to a hex code of dark grey, but the value is ignored by Windows! It continues to show the inactive taskbar as Olive.

The AccentColorInactive Registry key is ignored.

What could be going on here and how can I set the inactive Taskbar to MY preference ( and not some value that Windows pulls out of its hat??!)

@Hannele2

You can do a lot of things with the Taskbar if you use TranslucentTB from the Microsoft Store




If you choose to make the Taskbar clear and are left with a thin line on top... check this post...