Thank you for reaching out to the Constant Contact Community. It's my pleasure to assist you today.
I'm very sorry to hear that you are having issues selecting a list in the Email Automation section. If you can send an email to social_support(at)constantcontact(dot)com and include your username, the name of the automation campaign, the list you are trying to attach it to and a reference to this post, we are happy to take a look at what might be occurring.
Thank you for choosing Constant Contact. Have a great day!
Adrienne B. Community & Social Media Support
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