Bidirectional differential port on MAX10

I want to implement a bidirectional differential port on a MAX10 10M02SCU324C8G

I first tried to do it on my own and then tried to do it with the GPIO Lite IP too.

At the end of the day I get the same error:

Error (176202): The differential I/O standard Differential 2.5-V SSTL Class I cannot be used on the pin RC_A[0], because the specified pin uses a tri-stated output buffer.

Is it only possible to have either a dedicated input or output differential port?

Why is it even letting me configure the IP as a bidirectional differential IO?

Or am I missing something when it comes to pin configuration?