Comments: SparkFun Environmental Sensor Breakout - BME68x (Qwiic) Hookup Guide
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Your "default" address of 0x77 is actually BME680_I2C_ADDR_SECONDARY in the BOSCH Sensortec library, and their code don't work on your breakout unless either the library code or the breakout are modified, which is very unfortunate. Why did you pick their secondary address as your default?
from bm2680_defs.h (BSEC 1.4.8.0)
/** BME680 I2C addresses */
#define BME680_I2C_ADDR_PRIMARY UINT8_C(0x76)
#define BME680_I2C_ADDR_SECONDARY UINT8_C(0x77)