Yes brother you can try this method to get retail key in cheap, in fact I'm using this windows since I published this video and getting all the official updates.
This video is very much useful and very much genuine to install Microsoft office 365 for lifetime access in also online or offline mode without any problem.
I this case I think the account may be lost because In case of retrieving your accoung the OTP will go to the account I'd which is given in the setup pr provide and you won't have the access of it, so better to save password in your phone or write it somewhere