My understanding is that you contacted support a while back. Our guess is that you set a password and forgot about it. There is nothing we can do about it.
My advice is
- Create a backup of your vault
- Disconnect and Delete the remote vault
- Delete the notes on the computer that doesn’t currently have the up to date notes.
- Create a new remote vault and connect your Obsidiands to it. If you chose a password, write it down somewhere.
We do not recommend you mix Obsidian Sync and ICloud.