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This is because the setColumnPinned method refers to the colId that is supplied. In this case, you don’t have a column with an id of Sample name, but you have a headerName with a value of Sample name.
To fix this, you just need to add colId declarations to your columnDefs objects.
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In the end the solution to this was to use the: var colState = gridOptions.columnApi.getColumnState(); found here: ag-grid.com/javascript-grid-column-definitions
Source:stackexchange.com