No, when changing the oil in an automatic transmission, you do not need to warm it up.
Modern automatic transmissions (automatic transmissions) have a safety device that prevents the engine from starting if the oil level is insufficient. Therefore, the system must be completely drained before changing the oil.
In addition, warming up the automatic transmission can lead to contamination of fresh oil with remnants of old oil. This can negatively affect the efficiency of the automatic transmission and the service life of fresh oil.