I am experiencing issues with all of my arduino boards I have 2 unos and 3 different knock off minis all of which will not find/communicate with any I2c devices. In the past all of the boards were used with a heart rate monitor and OLED display with no issues. They are being used for a school project and over my spring break I ran into this issue. I'm not sure what I did to have them all stop working. I have tried reinstalling Arduino IDE 2.0.4 and installed the legacy version 1.8 but it made no difference. I've tried older verions of Adafruit SSD1306 libraries, using a second computer to upload codes, using 4.7k pull up resistors on SCL and SDA. Any help is appreciated!
Before doing anything else (having connected the board to your Arduino of course) run the Wire- I2C Scanner sketch. That will tell you the address of the board you have connected. For a BMP280 its 0X77 (with SDO = Vcc) or 0X76 (SDO = 0V).
Show us a schematic of how they're being used? A universal problem like that makes me think you're making a mistake with power, or misconnecting clock and data consistently.