I do not think my issue described in the post above is related to your link.
It seems that microG is (somehow) causing the trouble and not the banking app.
On my Xperia 10 V mircoG is still working (signature spoofing is checked) and I can open and run the banking app - but could not use it as if forces me to use the camera to take a picture of myself which is not yet possible with Xperia 10 V running Sailfish, compare [Release notes] Sauna 4.6.0.15 - #201 by Finlandia