It happens because the manual method does not convert contacts into CSV properly. And Google requires a specific column structure, but manual CSV files often miss headers or place fields in the wrong order. I faced import errors until I used a tool to convert VCF to Outlook CSV and Google-friendly CSV automatically. A dedicated
vCard to CSV converter creates files that match Google’s template, so you don’t need to adjust anything manually. If you want smooth import, use this
Softaken VCF to CSV Converter that supports quickly exporting VCF contacts to CSV in multiple formats, including Google CSV. You try it with a free demo edition.