I hit a similar issue when getting started with the WiFi_TinyShield_Example code.
It just would not connect and kept giving status 6 - WL_DISCONNECTED.

Based on the note by boostinallovryou, I ran a scan of SSIDs in my area using:
WiFi101/examples/ScanNetworks code from GitHub
after modifying Serial. to SerialUSB. and adding the setPins()

Turns out that my access point was configured for 5GHz only and so didn't show up in the scan.
Turned on 2.4.GHz and TinyShield connected right off! :-)