I get the error: Cannot bind parameter because parameter azure_owner is specified more than once.

How to provide multiple values to parameters that can accept multiple values?

if (current.variables.remove_admin == 'true') {
    parameters += ' -azure_owner "' + getAdmin(current.variables.u_owner.getValue()) + '"';
    parameters += ' -azure_site_remove_admin "' + getAdmin(current.variables.site_remove_admin.getValue()) + '"';