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So I did the modification on the HEADER and CCP file as supplied by you but still not sure whats wrong!
I now try to adress first one sensor to get back into function but it shows the error

"no...

Thanks for that hint!
Unfortunately the library don´t work with my sensors because they are not "Adafruit" brand.
So if I start the example sketch the Teensy compile properly but don´t show any...

Hello,
I´ve done a quick project on a Teensy 4.0 with two BMP280 sensors, connected via I2C (SCL0, SDA0 and SCL1, SDA1).
Actually I did not get how to proper initialize the second bus to get valid...