Board Thread:Boruto Discussions/@comment-38812954-20190920230637/@comment-1210805-20190923092939

It's not clear whether they can summon across different dimensions. The only example we have of that is Sasuke summoning his hawk in one of Kaguya's dimension, but seeing as he has the Rinnegan that may be the exception rather than the rule (especially as that case also implies he would have freed it from the Infinite Tsukuyomi.