I am having the same issue but this time with the 1116 schedule b . The form was updated with the update dated 3/11/22 but when i want to transmit it said that it was missing the attachment which i created and turbi did not have the 1116 sched B form error but cannot efile because it required an update but which i did numerous time. So I think the 1116 schedule B form is stopping the efile using the you need an update error efile message. I have already perform a manually update but still getting the error message. Perhaps my manual creation of the attachment schedule B form that turbo needed is messing my efile ?
