Reading RAS on an Android Phone Problems

I get a daily digest email from http://groups.google.com of the latest RAS articles. Sometimes I read RAS on a windows computer but often I read on my Android phone (Pixel 3 running Android 10).

Very recently I find that while I can read RAS articles (and other Google Groups) on my Android but I cannot reply to an existing article or start a new topic. The option just doesn't seem to exist.

This happens when using Chrome or Firefox but it is ok with the Dolphin browser. It appears to me that Chrome/Firefox are using the new Google Groups interface while the Dolphin browser is still using the old interface.

You would think that reading a Google group (albeit a usenet group) on the latest Google Android OS would be a great experience. Not so much. Anyone else seeing this issue?

Again, on Windows (using either the new or old interface) allows replies and adding a new topic. The only issue I see is that old interface allows "reply privately to author" while the new interface does not (greyed out). Windows browsing allows the user to change back/forth between the interfaces ... at least only for the time being it seems.

Please don't suggest me to;

- use another usenet news reader app. I prefer reading all my groups in a browser.
- buy an iPhone instead.
- stop babbling about my complaints!

Thanks!

- John