Issue:

All highlighted text in Teams has poor colour contrast when in Dark mode on desktop. While some may be readable, none of the highlight colour options meet WCAG colour contrast minimums.

How to reproduce

1. Go to MS teams app on Win 11 and set appearance to dark mode.
2. Create any default coloured text (this is white in dark mode) and apply any text highlight colour
3. The result is inaccessible: it does not meet WCAG colour contrast thresholds and is very hard to read.

Notes on behaviour

• On mobile (android MS Teams app) - the text colour changes to black which does meet the colour contrast minimum.
• This behaviour (illegible white text) on light backgrounds is also found on high contrast mode.
• This is different behaviour from MS word, which meets colour contrast minimum in a different way. Here highlight colours in dark mode are adjusted (e.g. the background highlight ffff00 --> is shifted to 393900 when dark mode is selected), and the text colour remains unchanged so there is enough contrast between the highlight and the white text colour.

What happens next

This needs a fix in make this accessible to users in dark mode so content can be read if another user has highlighted text.

I'm not sure if this is the right place to post this but I was unable to register my MS account on the https://learn.microsoft.com/en-gb/answers/