Lloyds Bank app authentication issue on iPad Air 2

I have an iPad Air 2 - running software version 15.8.3 and my Lloyds Bank app will not work. It hangs at the authentication screen and then just goes back to the main screen. I have been to Lloyds who have had a look but as it works on their iPads and also works on iPhones (of which I have one too) they are saying the issue is with Apple.

I tried the app on my husband's iPad which is running iPad OS 17.73 and it works fine. I am currently updating his iPad to the latest version to see if this has an impact on the how the app works for him.

Whilst in Lloyds bank this morning there were two other ladies trying to get their iPads sorted out too - I do not know what the outcome of this was but it would seem there is an issue somewhere along the line.

Any ideas?

[Re-Titled by Moderator]