In order to gain EMS an Uchiha had to take the eyes of an extremely close relative such as a brother. Direct family in other words. This proves that while it's true Uchiha share ancestry the clan has thinned out enough over the centuries to not be directly related to one another. Making it completely possible that when Itachi states only an Uchiha w/sharingan of his blood can break Tsukuyomi, the only ones capable were Sasuke and his father. Because these are the only Uchiha that would have shared a direct blood relationship with him and had sharingan.
Knowing this, Hagoromo who is so ridiculously far from the Itachi's bloodline in that case, hasn't a hope of breaking it.
Sorry not sorry.