Turbotax license code on different computers and accounts

My son purchased Turbotax Home & Business software (download version). My son installed it on his computer and now I installed it on my computer. After installation, it asked me to assign in with my Turbotax account first which I did, then it asked to enter the license code. After that, Turbotax software said "This license code is already linked to another account. Try login with another account". 

To my understanding, Turbotax license code can be used on 3 computers, can we use different Turbotax login on 3 different computers with the same license code?