Currently, we noticed that it is sometimes impossible to select the LED pattern indicated on the micro:bit onto the app during the pairing process. Since the app's DEL can only be selected from the bottom up, our suggested workaround is to select a pattern that only has LEDs from the bottom up. You can change the displayed pattern by holding the RESET+B+A buttons for a few seconds. Below are correct and incorrect pattern examples.
Advice and answers from the LTS_Help Team.