I would think if the Maestro BT was enabled and sending out a signal, your phone would at least see it when you did a scan with the phone and show as available. I wouldn’t try to pair it with the phone, but would wait for the app and its instructions.
I own a JBL EON610 speaker that has the ability to connect via BT to adjust some parameters such as EQ and update the firmware via BT. It was intermittent at times when I initially tried with their app on an Android tablet. It did show on the tablet as BT available. I did finally once get the app to work and I think got the firmware on the speaker complete, but there after the app does not work nor does the tablet show any BT signal. The firmware update either bagged the BT function or the BT module simply failed. There is no provision on the speaker other than BT to reflash the firmware or other get into it. Big mistake on JBL’s part to not provide an alternate access. I can do EQ and such externally, so not a catastrophic loss, but just sucks not being 100%.
JBL EON600 series block diagram. BT block highlighted.