Interface interpretationMicroprocessor data realize the communicationwith TM1637by means of two–wire bus interface
(Note: The communication method is not equal to 12C bus protocol totally because there isno slave address).
From https://www.mcielectronics.cl/website_MCI/static/documents/Datasheet_TM1637.pdf
TM1637Display display(SCL, SDA);
You should use different pins for I2C (RTC) and the TM1637.