Start and stop in order
Start device A and leave a known live item playing. Start device B only if the plan allows it. Note whether B starts, whether A pauses and whether either error identifies a connection limit. Close both sessions and repeat the check if the first trial was interrupted by a network change.
Report the plan and result together
Record the written term, app versions and observed order of events. If the plan limits sessions to one, use one device at a time and ask the operator how long a closed session takes to clear.