Can't logout iCloud iMac Pro Sonoma 14.0
Trying to sell my iMac Pro 2015 but unable to finish wiping it fully. Upgraded from Monterey to Sonoma because the Sign Out link greyed out. Still greyed out after update. Tried all the different methods but can't get it to allow me to Sign Out.
How can I fix this? Would a factory reset, non-disk utility get me back to start and then I wipe it out again after with Disk Util?
iMac Pro, macOS 14.0