A change was deployed earlier today at 10:52am PT which inadvertently prevented a significant number of autosends from sending for a few hours. We've rolled out a fix, so Assist should now be working as expected as of 4:14pm PT. This did not affect predrafted or autofilled replies which continued to operate normally -- this was isolated to emails that had been identified for automation.
We're adding tests to prevent this from happening again and looking deeper into our processes to see what other safeguards we can add. Thank you for your patience and understanding.