Translating to English:
Ok, now I have found a solution that is *NOT* easy for Vipps to patch.
This works *only* on Magisk-rooted phones afaik.
1: install "Universal SafetyNet Fix" as a module in Magisk: https://github.com/kdrag0n/safetynet-fix/releases
2: go to Magisk manger -> press the building block icon -> make sure "Universal SafetyNet Fix" is enabled. Further down (way down) you will find "MagiskHide Props Config", install it.
3: go to Magisk manager -> press the settings icon in the top-hear corner -> press "Hide the magisk app" -> set a new name that does not contain "Agisk", choose any random name (which you can remember, but not anything obvious like "root" or "magisk"), this is the new name of the Magisk manager icon (This is because Vipps searches through the list of installed programs, and refuses to start if you have the program "Magisk" installed.)
4: go to Magisk manager -> tap "Shield" -> tap MagiskHide -> tap Vipps
5: exit Magisk manager, go to the Vipps icon, hold your finger on it for 3+ seconds, then you will get a menu with a small round (i) button, press that (i) button -> if " Force Stop" button is not greyed out, press "Force stop" (otherwise ignore the button) -> press "Storage & cache" -> press both "Clear Cache" and "Clear Storage"
6: success, now vipps should work fine, as it can no longer see that you are rooted (if it still doesn't work, you can try to choose another name in step 3, and do steps 3+5 again)
