I've been following the topic about the TEZ app and I have a similar problem with Santander app. When I used the Android N with SuperSU, Santander has worked and still works today in my old S7. When I upgraded my Note 8 for Android Oreo the application didn't work anymore, not even open. I've tried a couple of 5 custom rom and none worked.
Last week I read the topic about TEZ and removed phone permission to the google phone play services and Santander ran until yesterday, but I lost the root in Magisk and restarted the Note 8 and the Santander didn't open more. I've uninstalled and reinstalled the Magisk and Santander and not solved.
Does anyone have any suggestions?