Thanks very much for using Codebook and posting to the discussion forum, although I’m sorry for the disruption after updating Codebook.
You’ll only want to generate a Sync Key on one of your devices and then import that Sync Key on each other device you’re syncing with.
It sounds like you may have mismatched Sync Keys, not to worry though, we can delete the ones that don’t match and re-import a single Sync Key from your remaining device. There are some instructions on how to do that in the Codebook 4 FAQ’s here: Codebook 4 Upgrade FAQ / Help under: “I setup multiple Sync Keys, or, I’m seeing a “Sync Key mismatch” error. What should I do?”
Let me know if this allows you to delete the mismatched Sync Keys, import a single one, and sync. I’ll be happy to help if you run into any issues or have any questions along the way. Also free free to reach out to the support inbox firstname.lastname@example.org