Cannot import shapefile layer into MSSQL database

I'm trying to import the 'Provincies' shapefile into my Azure MSSQL database.
The table is created, the projection is set but no features are imported.
For each feature I get this error in the 'Import layer' tool:

GDAL FAILURE: INSERT command for new feature failed. [Microsoft][ODBC SQL Server Driver] Characters trimmed at the right (translated from Dutch)
Failed to add feature to OGR layer.