You have an existing vCenter deployed in your environment and you would like to deploy a second node in Linked Mode so you proceed with the install of SSO on the second node:
Select Join an existing vCenter Single Sign-On installation:
… and proceed with filling in the fields to install but receive the following error:
Error 29103. Cannot read file or directory.
The reason why I was receiving this error was because my colleague who deployed the first node used the Simple install option:
… which does not support multisite as discussed in the following forum thread:
The solution? Uninstall everything in reverse order for the first node and reinstall using the appropriate multisite settings:
I went ahead and uninstalled and reinstalled the whole environment over the weekend to get Linked Mode up. Situations like these is why I prefer to do everything myself.