In what world does this make sense?
In the world of award tickets. You get what you get, not what you want or what "should be bookable".
You of course have the sensible choice to buy a cash ticket for exactly what you want.
Is there a workaround?
UA search is inaccurate for searching what UA has released to other star alliance partners. It typically has more awards!
Always double/triple check with other star alliance partners.
There is no availability on 3/30 for awards space for star alliance partners. However, there is award space on 3/31. Confirmed on several star alliance partners ANA AMC, Lifemiles and Asiana.
An option is to change your departure by 1 day.
see post below for work-around.
You would need to call A3 M&B to book this, since it doesnt show on the website. However, unlike the 30th, you have confirmed that the space is there for the 31st.
