Unable to parse CSV column names

When uploading a CSV file to Sigma I noticed all the entries getting parsed correctly based on comma-separation. However clicking on “Contains Header” indicating that the first row is a header those header names are not appearing as column names, but instead Sigma is auto assigning generic names.

In this particular case it turned out that many of the headers were numbers. If you prefix these with 1+ letters then they will be parsed correctly into column names.