Also be aware that " : D " without the space makes it an emoji on the board

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Using O365 v2503 - Did you know you can thank someone who helped you? Click on the tiny scale in the right upper hand corner of your helper's post

Thanks Pecoflyer

I did realise the emoji, but inserting a space would have invalidated the formula.

Tommy

You can disable smilies; if you're not already in 'advanced' view when composing a reply/question, you can click Go Advanced then towards the bottom you have:
2023-12-10_123136.jpg


Alternatively, you can wrap your formula in code tags:
2023-12-10_123711.jpg