Thank you for reaching out to us. I apologize for any inconvenience this may have caused. I do have a couple of questions in regards to this situation as we do have our engineers working on fixing this issue. Do you remember doing any large contact management (Removing, Adding), or repeatedly removing and adding the same contacts in to your account? There are a couple of workarounds you can try. The first workaround would be to trying scheduling and email campaign through a different browser if possible, for testing purposes. If that does not work, our most effective workaround would be to create a new list for the contacts you already have and transfer them over to the new list and delete the old one.
Steps for the second workaround:
Step 1: Go to the Contacts page
Step 2: Create a new list
Step 3: Go in to the list that already contains your contact, select all contacts.
Step 4: Select the ''Manage Lists'' option that will highlight after selecting all contacts
Step 5: Select ''Add to list'' that will appear from the drop down menu and add them to the new list created
Step 6: Delete old list, after moving contacts over to the new list.
If neither of these steps fix the issue you are currently experiencing, please let us know.
Tiago_R Community & Social Media Support
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