BL_INTERNAL:_STAGE is only supported in the SNOWFLAKE access engine.
I think this option is a SAS name, so I highly doubt that it could work in a connection options string.
The Snowflake ODBC driver supports specifying internal stage when using PUT. Not sure how make that work from a SAS libname though.
https://docs.snowflake.com/en/sql-reference/sql/put
If you plan to use Snowflake extensively from SAS I suggest you look into using the Snowflake ACCESS engine instead.
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