Sorbus rockii 'Pink Pearl'
 

Or Sorbus x rockii, perhaps. Seems to have a number of synonyms.

What a nice tree this is. I planted a whip 3 years ago, this is the
first year it has fruited. The heavy clusters have been a bright pink
for about a month and show no sign of rot. The birds have ignored it
for some reason although the red berried ones are stripped. Currently
has dark red foliage but the pink is bright enough to contrast still. A
good grower, nice upright form.