>>17855639
They had more luck with Silesian and Prussian Poles, who must have actually had some German admixture.

>Some Polish citizens of diverse ethnicities served in the Wehrmacht and the Waffen-SS, in particular in parts of Poland annexed by Germany such as Upper Silesia. Service in the German military was universal in nature in these areas, however, assessing the number of ethnic Poles involved is difficult due to the fluidity of national identity. At the low end, Polish estimates often place the number of native Poles who served at 250,000. Ryszard Kaczmarek of the University of Silesia in Katowice produced a conservative estimate of at least 295,000 based on documentary evidence; however, he considers this very low and is inclined to assume category III Volksliste were mobilized as much as males in the Old Reich, which leads to a maximum estimate of 500,000.[6] Early 1944 estimates by the Polish underground are similar, at 400,000-450,000 Poles from Reichsgau Danzig-West Prussia and Silesia.[6]

>German authorities assumed those classified as category III Volksliste were in fact mostly ethnically Polish, and marked their military documents with "Pole".
https://en.wikipedia.org/wiki/Military_enrolment_in_German-occupied_Poland