Hi Helen, I have seen this post only now.
Italian Army has used machine guns at Dogali in 1885, and at another battle of which I don't remember the name now. but in both case were managed by Italian soldiers, and attached to Italian white units.
at Dogali it jammed after the initial firefight.
In the various battles fought against the Dervishes only Askaris infantry and cavalry were used, with mountain guns as well.
probably the MG were a white men affair.
Honestly I have never found something to clarify this aspect.
cheers
Piero