Chat alerts not perceivable/accessible

My workplace and department use Mibew chat for Student IT Support. I can't perceive the audio chat alerts when we get someone needing help. There are only audio alerts. It would be helpful if there was a visual alert such as changing browser tab color or displaying an active alert on the screen saying there is a new chat request. Issue that alerts are not accessible (perceivable, robust). Looking to find a working solution because I can't fulfill the requirements of my job as it is right now

Environment

Mibew Messenger version: Browser
OS: Windows
Web server: A-B Tech
PHP: echo script tag for active alert prompt on computer when browser version of mibew webpage alert gets a chat request
PHP extensions: If there is a third party extension to do this, great!
MySQL:
Expected behavior

Perceivable and Robust (accessible) active alerts for new chat request. Having message notifications occur in more than one way. Having the ability to change settings to enabling or disabling types of active alerts.

Actual behavior

Can't perceive alert. No way of knowing if there is a chat request while on another browser tab, or program. I have classes I take that use Adobe programs and I don't have the screen real estate to keep that webpage actively open.

Steps to reproduce the behavior

log on to browser version of mibew. connect. do something else on computer while someone else sends chat support requests.

Mibew / mibew