I've created a calculated tag thru AF. It is now usable in Datalink and processbook, but it is not seen in PI vision.
Could you please check if PI Web API indexed all items for PI Vision to enable search using https://yourPIWebAPIserver/PIWebAPI/Admin/Search/data.html.
If it has indexed all the items but unable to show the details then would request you to check the security of the tag. i.e. if you using service account to run the application pool then check if it has access to the tag and delegation is set up to the PI Server accordingly.
I'm getting this error when trying to use the link you gave.
Retrieving data ...