Hi All,
The Authorization Error is just an info and not an actual error. The actual issue was there are around 10000 tags on PI server and the PCo query was not able to display tags because when MII query is made to PCo, it used to get timed out. While creating Data servers for PCo we have an option to set this Query time out value. By increasing the Query timeout value in Data server for PCo at MII end and reducing the tags list using Alias in PCo end resolved the issue.
Regards,
Jeedesh