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Check the lib_deps section in your platformio.ini!
lib_deps =
sparkfun/SparkFun MAX3010x Pulse and Proximity Sensor Library
mobizt/Firebase ESP32 Client@^4.4.17
mobizt/FirebaseClient@^2.1.8
rupakpoddar/Firebase@^1.0.4
mobizt/FirebaseClient@^1.2.0
You’re including 4 different Firebase libraries into your project!
Two of them are the same library but different version numbers.
That makes totally no sense. Only use one library!
So the correct lib_deps should be
lib_deps =
sparkfun/SparkFun MAX3010x Pulse and Proximity Sensor Library
mobizt/FirebaseClient@^2.1.8