Confused about encryption password

[boring10]

What is your sync target on your Windows 10 machine and did you also connect to your sync target on your phone?

You can try doing the following to see if it resolves the issue.

1. Change the master password back to what you had before on your Windows 10 machine.
2. Press the "Synchronize" button and wait until it completes.
3. Repeat step 2 until you no longer see any sync changes listed
4. On your phone, press the "Synchronize" button and wait until it completes. You may be prompted for a password at this time. If not, wait until it completes and then go to "Configuration" -> "Encryption Config" and ensure that encryption is enabled and enter your master password.

If that doesn't work then you can try to follow the steps listed at the link below.

[SOLVED] Encryption Sync Issues

Also keep in mind that you need to wait for the master key to be downloaded before decryption starts. That key can arrive at any random time during sync so indeed you need to wait for the full sync to be sure. If there’s just one note though there’s most likely a problem and you’ll need to check the log.