I’m having the same issue. The “fixes” I’m finding aren’t helping. What I think is the problem is that the Pixel embedded in the site is not the correct one FB is looking for, so the error kicks out. What I “think” the solution is is to manually replace the Pixel ID across the site as changing it within the Settings of the Facebook for Woo plugin is not working. Instructions that say that’s easily done date back to 2020 and the current version has no option for that. I’m about to embark on a lovely “Find and replace” and manually put in the Pixel ID I THINK FB is seeking vs the one that is in there now.