Thanks, Lisa for posting!  Yes, I think you are correct. The ones that have issues had an outstanding notice that I sent correspondence for (which probably hasn't been updated yet) and the others had some changes to their eligibility for child tax credits this year.  So some may be ID checks. So I guess there were some changes in general for these.  And yes, I was wondering the same thing if this would further delay their stimulus payments.  Ugh, so many uncertainties right now.  Thanks, for your input!