How can the suggestion of the Adhan by one of the Companions be reconciled with the belief that everything the Prophet, peace and blessings be upon him, commands is divine revelation?

The Adhan (call to prayer) was legislated by the Prophet Muhammad, peace be upon him, in Medina after the Companion Abdullah ibn Zayd had a dream in which he saw the words of the Adhan. The Prophet, peace be upon him, affirmed this dream, and Umar ibn al-Khattab's dream concurred with it. This dream is considered true and a part of prophethood. The Adhan became a prescribed religious practice through the Prophet's, peace be upon him, affirmation of the dream and his command to act upon it, as this coincided with divine revelation. It is further added that the Sunnah includes the Prophet's sayings, actions, and approvals, and the Prophet, peace be upon him, approved this dream, which makes it part of the Sharia.