I have a question about account progression

The problem I have is that I have a play email account and the account progression is in it, and I have another Steam account in which the account progression is also and I would like to be able to use the email account progression from play in the Steam email but it won't let me because it tells me that a linked account already exists.   Example:       play4@gmail --> Progression to behaviour               steam@gmail --> Progression to behaviour     I want to have in the Steam account the progression that has plus the progression of the Play4 account