Getting an error message after scanning a QR code while trying to sync, transfer or recover data? Here's what they mean and what you need to do / not do:
Failed to sync / transfer!:
Migration token was already used:
You cannot use the same QR code twice (except for back ups). Create a new QR code and try again.
Migration token expired:
You cannot use a QR code once it expires. (Sync and transfer QR codes expire after 10 minutes). Create a new QR code and try again.
Migration token is of the wrong type:
You are mixing sync / transfer / back up codes. Try with the appropriate QR code.
Cannot migrate to the same user:
You cannot sync / transfer to a device that is already synced.
Migration token refers to a deleted user/device:
You reached the maximum of 2 or 5 synced devices:
Free users are limited to 2 devices in sync and PRO users can sync up to 5 devices. To increase limit from 2 to 5, please upgrade to Delta PRO. If already at 5 devices, remove a device first and then try again.
Disallowing sync/transfer from an user which has 0 transactions:
We do not allow syncing / transferring data from a device that has 0 transactions, as a safety measure to prevent reverse sync / transfer that ends up wiping actual data. If you really want to sync an empty device onto another device, add a dummy transaction to it.