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I'm wondering if there is any issues with Google running into a bunch of 404's on the old domain instead of them being redirected since they are not "redirecting properly"
Even if you've told them the whole site is moving, they won't magically stop requesting stuff on the old site. (Google Never Forgets.) You question is just about your GSC account, right?,
some won't be redirecting correctly to the new domain but that's on purpose