Which SAQ do you need, or is it a ROC?
Answer the questions a QSA would ask in a scoping workshop. You'll get your likely PCI DSS v4.0.1 validation route, the reasoning behind it and the requirements to focus on.
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Talk it through
Want a QSA to confirm your scope?
Share your result and I'll tell you what I'd check first, and whether your scope can be reduced.