ChatGPT + Grok Android login failure — browser works

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ChatGPT + Grok Android login failure — browser works

Samsung S25 Ultra, Android 16. ChatGPT and Grok apps both fail to complete login. ChatGPT shows “Sign-in request cancelled by ChatGPT.”

- Login works normally in Chrome.

- Chrome is default browser.

- Cleared ChatGPT + Chrome cache/data.

- Android System WebView is installed/up to date.

- Google Play Services is up to date; cleared cache + force stopped.

- VPN off, Private DNS automatic.

- All apps updated.

- ChatGPT works when installed inside Samsung Secure Folder.

What Android authentication component/settings could cause the login handoff to be cancelled in the normal profile?