3. It is in the Tenth Door (Daswan Dwar):

When the soul is withdrawn from the nine doors and enters the tenth door – Dashwan Dwar – behind the eyes, it tastes the Ambrosia.

Beauteous is the township of the body¹, in which one buys the Divine Ambrosia of the Lord's Naam.

The body-village is the most sublime and exalted village, in which the merchandise of the Lord’s Sublime Essence is traded.

Guru Ram Das –
Adi Granth, Kalyan M4, Ashtapadi, p. 1323

The body has nine doors, insipid are their tastes; and it is in the Tenth that drops the Nectar. Oh God, be merciful that we may drink, the Divine Ambrosia through the Guru's Word.

There are nine doors, but the taste of these nine doors is bland and insipid. The Essence of Ambrosial Nectar trickles down through the Tenth Door.

Guru Ram Das –
Adi Granth, Kalyan M4, Ashtapadi, p. 1323

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Footnote:

1) Township of the body: As long as physical life lasts, the body is the dwelling for the soul.