justin_j Yes. If your authenticating is multiple lists you'll need to be careful about the embedded data fields you bring in. If the naming conventions are the same each time you authenticate you are going to end up overwriting previous embedded data fields.

That being said, if you want to authenticate to bring in specific contacts, namely, first name, last name, external data reference, and email, then multiple authenticators are not going to work because each time it's going to overwrite the previous.