Welcome to the Rogers Community Forums and thanks for your first post! 🙂
Utilizing the 5G network is usually the best option! Is the phone or tablet that you have the Google Home app installed on also connected to the 5G network? If so, have you tried to clear your app cache for the Google Home app and Uninstall/Reinstall it?
Also, have you tried any of the troubleshooting steps that Andy mentioned above?
In my case, devices like my google home mini, chromecast and chamberlain garage door opener all were trying to connect to the previous network. Factory resetting the google home mini & chromecast worked (w/ 5GHZ) and erasing wifi settings on my garage door opener allowed me to connect (had to use a 2.4GHZ network) I cant believe I havent seen this guidance anywhere in Rogers support forums after so many have added Ignite and have experienced this problem....not to mentioned a fruitless effort by Rogers tech support yesterday.
Also, set up technicians should be all over this and help customers before they leave - I have now spent an additional (probably) 3-4 hours to troubleshoot and figure out how to fix.