Are you getting some warning in your console(browser tab)
The AudioContext was not allowed to start. It must be resumed (or created) after a user gesture on the page.
If YES then follow this link to understand this behavior by browsers and made changes best against your use case, I don’t think its a core CC issue.
Most modern browsers do not allow to start web audio without user’s action.
So, for web platform, add a button to continue at the splash screen. As soon as the user clicks/taps the button, the browser will consider this as an action and audio will be activated.