with test site: http://www.msn.com
Gives following warning:
Invalid value: The background color is not a valid color (#224f7b). Platforms affected: windows10.
Invalid value: The theme color is not a valid color (#224f7b). Platforms affected: windows10
These are valid, so it may be a rule that needs to be fixed or an actualy bug, but it should work.
Generator: http://manifold-site-pre.azurewebsites.net/generator
with test site: http://www.msn.com Gives following warning: Invalid value: The background color is not a valid color (#224f7b). Platforms affected: windows10. Invalid value: The theme color is not a valid color (#224f7b). Platforms affected: windows10
These are valid, so it may be a rule that needs to be fixed or an actualy bug, but it should work.