And this is why you have to be diligent & vigilant when using API's (and other external sources).
If it was a Google Maps API change then it would not work on any computer. The OP states it does not work on some computers. Google Maps Embed API | Google Maps Embed API | Google Developers does not appear to have changed.
I'm using the same url since 2012 without issue.
Is the map being displayed in a webviewer or a browser? If a browser then it would be a different issue. Way to check url is to check in a newer web browser and see if it displays correctly. If it does then it's not the url / api.
FM for Windows webkit is based on IE
If it is a webviewer then it may be the emulation mode that FM webkit is using, I understand it to be IE 9. Webviewer shows nothing
The answer provided on the above link provided by user19752 will change the webkit to IE11.
Open command prompt, then
reg add "HKCU\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BROWSER_EMULATION" /v "FileMaker Pro.exe" /t REG_DWORD /d 11000 /f
will change the webviewer to IE11.
For FMPA, change the name in command to "FileMaker Pro Advanced.exe".