Yes and yes. Dominion voting systems are approved for use in Wisconsin, specifically the Dominion Voting ImageCast Evolution (ICE). Dominion the second largest voting equipment vendor in the state, and their systems are used in all or parts of these counties: Adams, Crawford, Door, Fond du Lac, Grant, Green, Juneau, Oconto, Oneida, Ozaukee, Price, Racine, Rusk, Sawyer, Trempealeau, Vilas, Walworth, Washington, Waupaca, and Winnebago. President Trump won most of those counties by sizeable margins.
Before determining the winner of the presidential election and certifying the results of other state elections, the Wisconsin Elections Commission and local election officials completed a full hand-count audit of 5% of voting equipment used throughout the state, including 28 reporting units that use Dominion ICE voting equipment. These reporting units were publicly selected at random the day after the election, and clerks in those jurisdictions were ordered to hand count all the ballots twice to determine whether the equipment had counted the ballots accurately. No problems were identified in the way that votes were counted for the office of President. Read the full audit report here.
The claims made about Dominion have not been substantiated. Attorney General William Barr said recently: “There’s been one assertion that would be systemic fraud and that would be the claim that machines were programmed essentially to skew the election results. And the DHS and DOJ have looked into that, and so far, we haven’t seen anything to substantiate that.” https://apnews.com/article/barr-no-widespread-election-fraud-b1f1488796c9a98c4b1a9061a6c7f49d