Originally Posted by
FltOFanC
....
If the partner fare rules are not compatible with UA rules, the UA website should not display the option. ...
It is a complexity that does not show until UA tries to confirm space. The fare rules are getting more complex than the search tools can handle.
Originally Posted by
FltOFanC
....The problem with Google Flight type comparison sites is that you have to actually go to a site from where you can make the booking. ....
It may or may not work, just trying to provide solution ideas. Sometimes you have to workaround the issues instead of waiting for the issue to be fixed.