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Is your .NET Framework version 32-bit or 64-bit?
The Oracle DB "bitness" doesn't matter. Neither does the underlying app server OS as long as you're not trying 64-bit apps on a 32-bit OS. What matters is the bitness of the app server process. All loaded libraries into the process must be the same bitness.
I already fix my problem: I downloaded the 32 bit version of ODAC, and install both ODP and InstantClient.
Now my application can connect to Oracle :)