When I use the Image to Keychain in the maker lab, there is almost always an error about non-manifold edges. It was created in the BAMBU maker lab. Wouldn’t that software create files that don’t have print issues? Why would the software even allow you to create something that has an error when printing. I’m talking BASIC images, too. Very simple, 2-4 colors, but very simple images (American flag, a single check mark in one color with the background another color). How can I make adjustments in the program to fix this issue?? Seems to happen EVERY time I make a keychain in the maker lab. Also, I have a mac and it says I can only fix it using Windows, so not an option. And yes, I have tried the free websites that allegedly fix the files with no luck. Either the fix doesn’t work, or I wait in line only to have the website time out on me and it never gets done. But again, WHY IS THE SOFTWARE EVEN MAKING THESE ERROR FILES TO BEGIN WITH?
I love your rant…
The problem is quite simple.
The keychain maker is not really their own creation, it is imported and made to fit.
You are correct to expect that such a tool for printing purposes would produce error free files.
But it is cheaper and provides more users if it works even with errors.
You can of course just have Studio (on Windows) fix the keychain model to fix those manifold problems.
Assuming you are not a skilled modelling software user, here is something that might work better for you than the keychain make in the current form:
Old Youtube video
For your case it basically means to use the keychain maker to just create the keychain itself and to import the SVG vector file with your images as a modifier.
In the old days Vector Magic was the go to program to vectorise images in colour but that no longer exists 
Good thin about this method is that you can import literally any keychain or other model you like to apply coloured images to it…
does it actually have any real issues if you try to print it? I’ve never had an issue printing anything with the non-manifold edges error. It is more of a warning, but I’ve never seen it actually affect anything related to printing.
I did. That, however would be irrelevan in Image to keychain generator unless the generated model either doesn’t slice or resulting slice looks very much off.
Sidenote regarding non-manifold errors:
In my case that’s usually either overlapping unnecessary edges that indeed do not cause problems or really bad curvature problems when unnecessary face on curvature causes whole model to either explode or instead of gentle curve it’s just flat face turning “nice planter” into “a block of plastic”
Anyway - @EvaTesla - if the slicer allows you to slice the keychain and the resulting slice and subsequent print all look “ok” then it’s as @Just_say_no_to_poop said - just a warning.