I am trying to enable authentication with Constant Contact for a client. I want to use their email, but when I enter it, I get an alphanumeric error. It says that one character has to be alphanumeric. I don't understand. I am using alphanumeric characters....
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Broadly speaking, the authentication address is set up the same as an email address. The authentication address you set up needs to be unique and not in use by another Constant Contact customer, and please make sure you follow the do's and don'ts below.
DO make sure you using only: