LineageOS encryption not working dispite being told it is
Most probably, you have default encryption where the password is default_password. You need root privilege for ADB.

Issue command in shell:

adb root
adb shell vdc cryptfs verifypw default


to check that.

You can always change the encryption password from UI and require that password at boot (preboot authentication) or much secure, define different lock screen &amp;&amp; encryption passwords