hodj67 Yes, but I don't want to reduce the security of everything else just to accommodate the banking app. The irony of having to reduce security in order to make a "secure" banking app work properly is a bit much.
Turning off 'secure app spawning' reverts to using AOSP's app spawning model. Stock PixelOS does not include GrapheneOS' hardened app spawning. No, it's not recommended to turn it off, but it's objectively more secure to use GrapheneOS with secure app spawning disabled than to use stock OS. If this app works on GrapheneOS with secure app spawning disabled then there really is no reason to return to stock OS. (Unless there is some other feature you also require of course).