Session 16-Bilaal Ibn Rabah- How could the Athan be legislated through a dream and not to a Prophet?

Bilaal ibn Rabaah(ra) "The Rock of Fortitude" Session 16 How could the Azaan be legislated through a dream and that to not to a Prophet? The reasons given by the respected scholars to why is wasn't given to the Prophetﷺ. The Rawafid quoting fabricated reports to discredit the Sahabah(ra) with regards to the Azaan and also fabrication about Bilaal(ra) recital of the Azaan. Important rulings in regards to the blessed Azaan.