After many month trying to resolve a client errors i find that:
[data-ogsb] (ogsa, ogab, ogac) is not working because Outlook implements an inline !important styles.
[owa] is deprecated.
The next code work perfectly outside @media (prefers-color-scheme: dark):
/* Outlook */
[class~="x_outlook-text-darkmode"] {
color: #010101 !important;
}
Works because when rendered, it implements x_ berfore your class.
Thx!!!