Hey and welcome to the Cryptomator Community 
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You didn’t move/rename the vaults in the cloud?
If you remove one of these vaults from the app and re-add it, can you open that vault again?
Can you enable debug mode, try to unlock a vault with the message “Vault not found” and send us the logs: How do I enable debug mode on Android?
No, the problem with the root directory can be recognized, among other things, by the fact that the name of the vault is empty. That actually does not fit here.
