A18 plus Paired with Bluetooth Microphone B01 test if ok to Control realptt app?

A18plus Paired bluetooth microphone. and we test the realptt talk.if B01 can control the realptt talk.
There are two steps of pair.
First B01 Bluetooth microphone pair to the A18plus phone.
Then the bluetooth function must be set In realptt setting.
Then it's OK to use now, if not work, please power off and on.
As the first time I try, it doesn't work. Then I power off and on, it work.😂