I ran into this when I attempted to update my maps. It stalled 20% of the way through and I could not get it to get further than 20%. Finally I cancelled out of Maps completely. This left me with no map at all. Restarted app and got this Error 808 claiming "No Internet connection". The Wi-Fi internet connection was just fine and worked with browser, etc. I do not have a data plan on my phone, and never have. Original installation of CoPilot was done with WiFi only setup on my phone and worked perfectly. I paid $8 and got the voice directions option which also worked just fine. Uninstalled app and reinstalled, logged in, and then it gave same error 808. I am stuck.
I used to have a functioning phone with Copilot, UNTIL I attempted a map update.
THE FOLLOWING IS MY WILD GUESS: It is nowhere documented that I can find, but some time in the past year or so I believe that Copilot switched to requiring a mobile internet (i.e., "Data") connection for initial installation and map upgrades. Thereafter, it will function fine with no Data or WiFi internet connection.
When I first installed it I had only WiFi (as I do now) and the installation and initial map download as well as paid option for voice direction commands all installed and functioned just fine. UNTIL the MAP UPDATE today!
I have had the same problem (April 2020). After reinstalling CoPilot, I could not get past the account login until I turned on cell data temporarily. There was no way I would pay for cell data to download maps so I shut it off after that. I'm still unable to download any maps despite having a great wifi internet connection. CoPilot support have told me to reinstall the app (which obviously didn't help since this is how it all started).
April 2020 followup: After multiple retries (unintall app, wipe SD data area, reinstall app, reboot phone) and rebooting the internet modem, somehow CoPilot finally started working again via wifi. It is not clear whether the modem reboot was the issue or whether they fixed something on their end.