I get the error message "Exception: Cannot remove old storage config while it is still in use. Please migrate to the new storage config first before upgrading.". It seems this is usually because the steps to migrate from the old to new storage on Truenas have not been done or done correctly, but as far as I can tell I have followed the instructions correctly.
I also see needing to uncheck the use old storage configuration button in Truenas, but I don't see that option anywhere, which usually indicates needing to do a custom app to upgrade, but following the instructions on the truenas channel of the discord it seems all I need is to update datasets.