Most people use "Speed Tests" to check their internet. But Speed (Bandwidth) is irrelevant for gaming. Fighting Games use very little data, but they need it to arrive consistently.
It is better to have a Stable 50ms connection than an Unstable 20ms connection.
BracketFlow Ping marks a connection as "Unstable" if Jitter > 30ms, even if the average ping is low.
You are the referee. You create the session, send links to Player A & B, and watch the dashboard yourself. Ideally, run this during a button check or the first match.
You want to test your connection with a friend. One of you creates the session, sends the link to the other. BOTH of you can open the dashboard link to see the graph!
Don't just stare at the graph. Play a friendly match or do a Button Check with
the tool running in the background.
If the connection feels stable and the graph is green/blue: It's approved.
If you feel lag and see red spikes: The result is final.