groups created with section_ prefix

Hi,

Have just started investigating SDS. When run, Teams get created as expected etc and membership is sorted, but the underlying 365 groups are prefixed section_

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what causes this, and what do i need to do to either have something sensible, or nothing at all? Im using CSV2.1 format, which doesnt have a SECTIONS.CSV file, and this feels like a hangover from the 1.0 files. In cases its important im in the UK, and there is a specific UK 1.0 definition that also has SECTIONS.CSV but im not using it - there doesnt seem to be a UK specific version of 2.1

Any help appreciated

Jim