You can first try to see if other Bluetooth headphones have a similar situation, and it is recommended that you try to put the left and right headphones back into the charging box, close the charging box cover, re-open the cover after 5 seconds, take out the headphones and try again, or put the left and right headphones back into the charging box, press the function key for 2 seconds, and re-pair it to try.
Huawei cannot connect two Bluetooth headsets at the same time. Huawei mobile phones support the connection of three Bluetooth devices that can generate sound at the same time. However, due to the current audio capability, the Bluetooth music sound is played only on the last connected Bluetooth device.
This is the earphone in single-ear mode, it is recommended to take both earphones out of the earphone bin at the same time, you can automatically pair in binaural mode.