The principal officer of a retirement fund must be a Eswatini citizen.
"Principal Officer of a retirement fund
11. (1) Every registered retirement fund shall have a principal officer who shall be a Swazi citizen resident in Swaziland. [...]" (RETIREMENT FUNDS ACT, 2005)

RETIREMENT FUNDS ACT, 2005
[<a href="https://www.fsra.co.sz/legal/legislation/The%20Retirement%20Funds%20Act%202005.pdf">Act</a>]