I am trying and importing a file in a new standard list but I am unable to map by either header rows or manually since the system imports all data into one column.
The CSV file is comma delimited and contains these columns:
_MobileNumber_LastName_Email_CountryCode_ContactKey Do I need to configure anything ?
You have the right columns based on the outline here: https://help.marketingcloud.com/en/documentation/mobileconnect/contacts/import_contacts_to_a_standard_list_or_all_contacts/prepare_file_for_import/
However, if it maps it all into same row it seems that there must be an error in your source file. You should be able to select manual and then map:
