I am very sorry for the problem you are suffering with the BT Mobile app. I just wanted to let you know that BT are aware of the issue and working on a fix ASAP. When I get further info to share I will do so here on this thread
Sorry once again for the inconvenience this has caused.
Thanks for your continued patience while we looked into this issue and please accept my sincere apologies for the inconvenience this caused.
I have some good news, the mobile team have let us know that their investigation found an problem and that a fix was implemented last night which cured the issue. We are confident that you should have no further problems. Sorry it took us a while to sort this out.
Mine did not work until I reset it and got a new pin number. Working fine since then.