Pairing process is erratic in Android 9

[microbit-mark]

https://support.microbit.org/a/tickets/43035
https://support.microbit.org/a/tickets/45003

Describe the bug
Using Android Bluetooth pairing and the serial Bouetooth app works as expect.
Using the micro:bit Android app pairing. The app asks to enter a pattern, then that you will be promped to enter a PIN, then reports success, then on reset reports failure

To Reproduce
Steps to reproduce the behaviour. e.g.:

On completion of Step 1 and releasing the micro:bit reset button:
Micro:bit screen fills;
then displays the bluetooth logo;
then the unique pattern

After entering pattern and pressing “Pair”
Says: “When asked for a PIN, press button A to enter code
(you only have 30 seconds).”
There is no place to enter a PIN!!

Says “You have successfully paired
Please press reset button and you’re done.”

Upon pressing the reset button
Says “Pairing unsuccessful Cannot pair with micro:bit. Retry?”

After completing the task the micro:bit displays the character that I have programmed it to display on successful connection, but that’s all.
Following on from this the micro:bit is programmed to repeat a message that should be displayed by the Terminal app.

If I pair using the Android device pairing facility in Settings everything works as expected.

I have tried two different micro:bits with the same results.

The events listed above are the best I can do bearing in mind the speed at which things happen. It would be helpful if there were user controlled breakpoints.

Expected behavior

Screenshots/Recordings

micro:bit version

• V1.3, V1.5, V2.0, not hardware related [Edit as applicable]

Device

• Make: [e.g. Motorola]
• Model: [e.g. G8]
• OS: Android 9
• App Version [e.g. 2.8.8]

Additional context
Add any other context about the problem here.