Speech button causes error

This is the error that I get when I try to use microphone to input spoken answer.
“Oh no! There was an error: network - sorry about that. Speaking is an experimental feature. You may need to refresh the page or update your browser permissions. Please let us know if the issue persists. Speaking works best on the latest version of Chrome on desktop.”
I am using Microsoft Edge, which is effectively a chrome browser. The microphone is allowed to use the https://www.clozemaster.com/ website.
Who do I contact to let Clozemaster know.