The "mirror" copy is not accessible to clients, if you want to use the mirror for reporting and reading from etc, you will need to create a database snapshot of the database and point your clients to that.
What is your purpose for mirroring? Secondary reporting? HA DR?
Also why was mirroring chosen? The technology has been on the depreciated list since the release of 2012 as MS advise to avoid it and use Availability Groups instead.