Wikipedia's Atanasoff-Berry Computer article states the ABC "was the first automatic electronic digital computer...The ABC's priority is debated among historians of computer technology, because it was neither programmable, nor Turing-complete." A 1973 US federal court ruling (Honeywell v. Sperry Rand) held the ENIAC patent invalid because ENIAC derived key ideas from the ABC, but that legal ruling settled a patent case, not the historians' definitional debate over what should count as the "first" electronic digital computer.
What would resolve this A settled, family-wide definitional standard for what counts as a "computer" (mere electronic arithmetic vs. programmability vs. Turing-completeness) applied consistently across every early-computing priority claim, which does not yet exist in the historical literature.
OpenWikipedia contributors, Atanasoff-Berry Computer (Wikipedia)