MSFS ATC frequency

Hi,
I use BATC and Navigraph.
BATC shows me a frequency, but I can’t find it in the Navigraph list.
My question:
How do I find the BATC frequency in the Navigraph list?
The BATC frequency isn’t listed in the Navigraph list.
In this Case ist 135.800 Center

Thank you.

Here:

As to why BeyondATC is having you on the Brazil Curitiba Center frequency while you are in Uruguay Montevideo airspace, that is a question for their developers.

There is no usage of 135.800 MHz in Uruguay that I can find:

Regards,

Tim