This from the tax office:
“From 1 November 2021, if you have new employees start, you may have an extra step to take to comply with choice of fund rules if they don’t choose a super fund. You may now need to request their ‘stapled super fund’ details from us.
A stapled super fund is an existing super account which is linked, or ‘stapled’, to an individual employee so that it follows them as they change jobs.”
You can read the full details here