Northern high bush used to produce. Now for last 3 years, it blossoms but never has any fruit. It's in the same location and amidst other producing bushes.
Blueberry Bush Flowers but No Fruit
Certified GKH Gardening Expert
This is a pollination issue. The other bushes may be self pollinating while this one needs a little help from friendly pollinators like bees. These articles may help with attracting pollinators:
The other issue may be that there is fruit, but it is dropping early on. This is caused by stress to the plant. It may not be getting enough water or it may have a pest or disease. Consider treating it with both a fungicide and a pesticide as a precaution and see if you can't get it some more water.