Unable to copy an automated series

I created an automated series and sent a test email to a TEST list. Now I want to copy over the series and save it with a new name and send it to a list. But the system won't allow me to save the series with a new name. Keeps giving an error.

Name of the series I want to copy: 10DayEnergyChallenge Series (Sep 30,2021-May 10,2022 List)!

Here is the error, I keep getting. I have tried using many different names for the new series but it doesn't work.