So, I've been wrestling with the same issue since being coerced into upgrading to windows 10. I have a Pixma mg7150 that had worked without any real issues up to that point. So I finally decided that I would like to scan some documents at home only to realize that after the upgrade the wireless scan function from the printer's touch screen wasn't working q.Q.
After troubleshooting everything under the sun one by one following restarts of the computer and printer upon each test (uninstalling printers, reinstalling printers, resetting the printer to factory settings, reinstalling software for the printer from the full install package, reinstalling software from individual downloads of each specific tool, checking router settings, checking the printer network settings, etc.) it came down to actually checking off the XPS drivers on the install after finding that this was never even included in any sort of "troubleshooting" by default... and one would think that XPS drivers wouldn't relate to what are, seemingly, network issues. Don't ask why I didn't just install everything from the start... I think it was one of those moments where you go "ehhh, am i reallllllly going to need that?"
As soon as I ran that (thinking it can't be something so simple or potentially unrelated to connectivity / network issues) the printer was able to do the following:
1. connect up to try to update its firmware (it didn't need to since i did that manually)
2. detect my computer when using the printer's touch screen menu in the scan function
3. scan wirelessly from the printer's touch screen scan function
::sigh::
It was either what I did here or the cookie i spilled into my cooling fan that fed the magical computer gnomes and made them help the wireless scanning function on my pixma mg7150 work again.