Did you look at the time that had passed?
17 hours had passed till I decided to stop it and realized it was not working.
This happen before and list time I add to pass a parameter that is not exposed in the user interface.
I believe this is what i had to do last time to get it to start:
From Binhex-preclear: Preclear Docker FAQ
Alignment Options (-a and -A flags)
Below is the logic built into the preclear script when determining the starting sector for the partition:-
if preclear -a option chosen and drive < 2.2TB then will set to 63.
if preclear -a option chosen and drive > 2.2TB then will set to 64.
if preclear -A option chosen and drive < 2.2TB then will set to 64.
if preclear -A option chosen and drive > 2.2TB then will set to 64.
if preclear -a or -A not defined then 63 or 64 will be chosen based on unraid config, UNLESS the drive is > 2.2TB, in which case it will always be 64.
For some reason the aliment is not getting chosen automatically