Audio won't play in Articulate Review

I'm having the same issue when testing in Review in both Chrome and Edge. By default, the audio is silent, but if I click the screen, the audio starts. Have never had this issue before today and appear to be running the latest versions of all software.

Update (17th June): The initial Storyline file I was working with had no audio on the opening slide, and when I viewed the course in Review, the course played by default. I've now added audio to the opening slide and when I republished to Review, I was required to click the 'Play' button to launch the course (which is typically what happens for me in Review). Additionally, the audio is now playing. I can only assume that - in my case anyway - not having audio on the opening slide was causing the issue. For others, if you don't want audio on the opening slide, it might be worth adding a silent audio track to the opening slide anyway to see if that fixes things.