Thanks! As near as we could tell, yeah, we asked a lawyer what they thought the reason was since we didn't want to mess it up (we'd done everything up until this point by ourselves) and he said he didn't think anything was missing from the packet but to just sent them over our 2022 taxes and that should do it, which it did! Seems a bit daft if you ask me given they had the previous few years, but thankfully it didn't create a huge delay.