Hello, and thank you very much for your assistance.
Following receipt of your email, I figured I'd run through all the steps again before responding. I did so and got the same results stated previously. HOWEVER, this time I used the ROKU feature to RESET my network connection, rather than just checking it and trying a different wireless router. The RESET network appears to have done the trick as the F1TV app recognized the Internet connection and opened up like normal. - SUCCESS - I even checked if there was a necessary update and none was required.
Thanks again for reaching out as it encouraged me to try everything again, while recognizing that I hadn't yet tried the RESET network connection option. BTW, this was on the 4K USB Stick version of ROKU. I was pleased that I did NOT need to do a factory reset...which would have required reconnecting my many subscriptions.
Bring on the Japanese Grand Prix!!! Whoo hoo!