The Optik App works for me, using my Telus ‘My Account’ credentials. Possibly your account needs to reset the App credentials. If the issue continues beyond today, you may need to contact Telus for a full reset.
I get this error on both my phone (Samsung with Lollipop) and laptop (Win 10 with Chrome) when I try to login with my Telus My Account credentials - but it works with my Telus Optik on the Go credentials which are different from the My Account credentials. Perhaps this is another case of a Telus tool that doesn't work if you have Fibre service e.g. the My Account tool doesn't work for managing Optik TV if you have Fibre service.
I'm getting the same message (LP1008). The Remote Record app - which I used to use - is telling me that it can't find my email address and the TELUS "My Account" app is telling me that it "could not retrieve my service information, please try again later" (although it does tell me how much my bill is).
Not sure what is going on here, but everything appears to be a bit of a mess.