I had this problem as well in Mendix 9, and am planning to address it in a new release soon. In the meantime:
- Find the file /javascriptsource/OIDC/actions/JS_OpenAuthURL.json
- Change the version number to 3.6.3
- in the same folder, use the command prompt to run “npm install react-native-inappbrowser-reborn”
After that, you’ll want to build a new developer and distribution app.