SQL to Excel Data Connection with Mirroring

I've got a spreadsheet that pulls fine and dandy from the ServerA when it is the principal in a 2-server mirror setup, but as soon as ServerB becomes the principal, Excel no longer is able to retrieve data.

There are two setups I've tried:

1. With the database I am querying as the initial catalog in the Excel data connection, in which case I get "Cannot open database XXXXX" requested by the login. The login failed." when refreshing data
2. With master as the initial catalog, in which case I get the error "Database 'XXXXX' cannot be opened. It is in the middle of a restore." when refreshing data

My connection string is as follows:

Provider=SQLOLEDB.1;Persist Security Info=True;User ID=XXXXXX;Initial Catalog=master;Data Source=ServerA;Extended Properties="Failover Partner=ServerB";Use Procedure for Prepare=1;Auto Translate=True;Packet...