Hi @Adara Astin31 Based on your screenshot you used an A/B Test Subject Lines. Based on this guide HERE31:
☝️ NOTE: Make sure that you take into consideration the 4-hour test period before running an A/B test! It might not make sense for time-sensitive emails where 4 hours would be too long to wait for the full send.
Since it's been a few hour since you sent it, if it still shows processing sending you can reach out to firstname.lastname@example.org.