Not sure if this could be an issue, but just wanted to touch on something about eligibility for Echoes.
Same as your alts’ eligibility relies on your main’s possession of rank 3 Essences that the alts themselves do not yet possess, your main relies on your alts to have rank 3 Essences that the main does not yet possess.
Only after a character has met the eligibility requirements themselves will they be able to earn Echoes.