Provide more legible text colors.
Teams provides a limited palette of text colors and little thought appears to have gone into their selection; many of the choices result in illegible text.
I suggest reviewing the recommendations established by the W3C in Web Content Accessibility Guidelines (WCAG) 2.0 technique G18, "Ensuring that a contrast ratio of at least 4.5:1 exists between text (and images of text) and background behind the text".

1 comment
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Sean Ellis commented
Microsoft's own UI guidelines say that applications should respect the user's choice of fonts and colors, as set in the control panel.