Yes I have, and I am pretty sure the conflict starts as soon as I add both the BNO086 IMU and the LED strip together. When I leave one of them out, the other one runs smooth.
I haven’t tested that with the Teensy but with the ESP32 it was like that.
If I find time today, I’d like to try and see what happens if I do not use all 10 but just 1 LED, maybe that easens the load on the I2C bus enough so it will work.
The IMU is a must-have. If I won’t get LED strip to work, as alternative I thought about adding a second Qwiic button that is not interactable by the user but it also has a nice single LED that can be controlled; the Qwiic button LED worked flawless so far.