Messages not being received by app

BT problem.
I just flashed firmware-tbeam-US-0.6.3.bin & firmware-ttgo-lora32-v2-US-0.6.3.bin
to 2 devices each. Same behaviour on both phones.
‘You haven’t yet paired a Meshtastic compaitble radio …’, but I have, and it shows in the list under ‘Please pair in Android settings’.
Sent in bug reports from Huawei TRT-LX2 (‘Y7’) & Samsung SM-A205YN.
What am I doing wrong?
Greg