Hi @Chris Nash ,
I could type this mark on my Teams client using ALT 130.
Please check if the Windows 10 language and Teams language are both English.
And after some tests, it seems that one of my test environment failed to show the results and it convert to a "?" for every input ASCII chars.
I think you could uninstall the Teams client and reinstall it, this article may help you on this: https://adamtheautomator.com/uninstall-microsoft-teams/
Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.
Best regards,
Lou
If the response is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.