ntop
Sorry was on a business trip with limited connectivity.
I tried to install version 2.71.0 (6710) and it worked. This means their latest version requires attestation or something similar and won't work unless they lift the restrictions. Starling bank did but Lloyd's didn't. I won't hold my breath on Barclays, this old version works for now but will stop working sooner or later as it will demand an update...
You can download it from Aurora store by opening Barclaycard app, tapping the 3 dots in the top right corner, then selecting "manual download" and entering 6710.
Don't forget to uninstall the existing version first otherwise it won't install. Once installed, blacklist the app in Aurora store so it won't attempt to update it.
Do you have any feedback from Barclays by a chance?