An employee is enrolled for an employment if they are aged 23 to 60, earn €20,000 or more a year across all their jobs, and pay into no pension through payroll for that job. NAERSA, the State authority that runs MyFutureFund, checks eligibility from Revenue payroll data and enrols them. You do not decide who qualifies.
Staff outside those limits can opt in, and you then pay for them on the same terms. There is no waiting period, so a new hire can be enrolled before they could join a company scheme that has one.