- You need to size the primary role on the secondary server. On the secondary server, type: Set-AdfsSyncProperties -Role "PrimaryComputer"
- At this point it is better to rebuild and join the farm that is now hosted by your former secondary (which became primary with the previous command). It is just easier that way.
- I can't comment on this one as I am not sure what the screenshot refers to.
- The secondary will not update data until you take over the primary role.
Note that if you have more than 1 secondary server, you also need to run the following on them to make sure they also know that the primary is now one of the former secondary:
Set-AdfsSyncProperties -Role "SecondaryComputer" -PrimaryComputerName "<FQDN of the new primary server>"