Hello @qc3 and welcome to the Community!
Thank you for sharing all the troubleshooting steps you've taken so far. Are you able to access the Ignite TV App from any other device? Are you able to successfully log in via the browser? Just need a little bit more info to assist you further.
@zee, have you had a chance to try the troubleshooting steps listed in this thread? What device are you using? And when did the app stop working for you?
Looking forward to hearing from you,
I would recommend you to try and access https://ignitetv.rogers.com/ on a laptop or PC on Wi-Fi to see if you're able to access the service.