Die Prüfung hebt die Anforderung an das Erschaffen eines Verbündeten in den Regeln für die Beschwörung eines Verbündeten dafür nicht auf. Die Prüfung 'sagt' nichts anderes:
Street Magic schrieb:Familiar
This ordeal requires the character to summon an ally spirit (see Ally Spirits, p. 103). It is only available to magicians able to summon ally spirits and then only to those who design their own ally spirit formula. The initiating character need not have taken the requisite Ally Conjuration metamagic (see p. 53) beforehand and may take it as the metamagic technique gained during the initiation she is currently undergoing.
Ally Conjuration
For a magician to be able to summon the unique spirits known as allies (p. 103), she must first take the Ally Conjuration metamagic and possess a ready ally spirit formula. This metamagic grants her the power to mold and enhance a bound spirit she already possesses according to the “blueprint” of the ally spirit formula—thereby granting it remarkable new abilities and often modifying its original personality (often subconsciously grafting on an aspect of her own, especially when combined with the Familiar ordeal). For more details, consult p. 103.
In dem Kontext ist das 'may' also so zu verstehen, dass man die Metatechnik überhaupt quasi während der Prüfung und während der Beschwörung nehmen kann.
Wenn man das nicht tut scheitert man mit der Transformation des Geistes in einen Verbündeten und entsprechend auch mit der Prüfung.