This seemed to work and imported my old fields across to the new setup.
One final thing that is not working now is the way I am updating the fields previously.
e.g.
update_field(get_acf_key(‘dob’), $dobVal, ‘user_’ . $user_id);
Has this changed? Also ‘get_acf_key()’ is a custom function which returns the key of the acf field e.g. ‘field_56ceaffe771d0’
Thanks.