To update a FlashArray connection find the FlashArray connection in the vRO inventory and right-click and choose Run Workflow or select it and click the green start button on the top panel:
Find Update FlashArray Connection and click Select.
Update the credentials, name, FQDN, REST version as needed. No matter what, you must re-enter valid credentials to complete any change.
Running an update connection on a connection will also ensure the array is in the right Pure1 organization. So if it is currently in the Uncategorized organization because its owning organization was not yet registered in vRO, but is subsequently, when the update connection workflow is run, the connection will be moved to the right organization.