@Robert_F and @connor, So, I’ve written two rules for the firewall. One for TCP and one for UDP as you suggested, then closed the admin program. ARC then showed proper configuration on iPad and Android. Then I left to run some errands. ARC on my android phone has frequent, lengthy pauses when using only a cell signal. Even when using a five bar strength and 5G signal and playing at low quality I could not listen to a song from Qobuz or one stored on my Nucleus using ARC. My cell signal at the Nucleus location is not great, only one or two bars of 4G LTE but this should not be the problem since this is an internet issue.
When I returned home I still had all my Roon end-points and they worked fine on the Regular Roon App. This was very good news.
FYI: Turning on the wifi when at home allows ARC/Android to play at high quality without interruption. Still don’t know if using a different wifi (like at a McDonalds or RV Park) would have a good result. Of course, I can play all the files stored on my phone using USB Audio Player Pro which is OK. And Qobuz MP3 streams fine on only two bars. I would like for this to work but it’s getting to be alot of trouble. Thanks for any help. John