Deactivate was grayed out because there was a blank value in the account field. The blank (Null) account could not be deleted. Therefore deactivate was not available as an option.
The null account was not valid so it would not allow the deactivation.
Salesforce Securlet. Any environment.
Customer went to the deactivate page, hit purge, and then was able to rename the null account to a named account, then it let them deactivate. They were then able to Activate the securlet and create a new account.