[Arbinknit]

..what is taking rebirth is not a soul, not the unreal ego, but neither "only" a impersonal sum of actions...

Sandell

The Buddha did not teach it was the duty of a monk to teach not-self to lay devotees.

The duty of a monk was to teach lay devotees the way to heaven (rather than to Nibbana).

The ascetics and brahmans thus ministered to as the Zenith by a householder show their compassion towards him in six ways:

(i) they restrain him from evil,
(ii) they persuade him to do good,
(iii) they love him with a kind heart,
(iv) they make him hear what he has not heard,
(v) they clarify what he has already heard,
(vi) they point out the path to a heavenly state.

Sigalovada Sutta