AT&T Call Linking Feature USELESS

[jonelli]

I have three phone numbers on my AT&T account, one is mine that I also use for business, and one is my wife's. 
It didn't make sense to link my number to Alexa since I'm not at home when I make my calls, and it would make no sense to bother my wife all day with incoming business calls.  So, I thought it would be nice for Alexa to be linked to my wife's number.  But, there is nowhere in the Alexa app that can specify using anything but the primary number on the AT&T account.  Even tried it from my wife's phone, doesn't work. 

So, this was a useless feature.  How many households are single people with one phone and one AT&T account?