in what anime does the main character thought he got isekai'd but he was actually told by his mom to go there

Answer 1

The anime you are referring to is "The Devil is a Part-Timer!" (Hataraku Maou-sama!). The main character, Sadao Maou, thought he got isekai'd (transported to another world) but he actually ends up in modern-day Tokyo after being banished from his own demon world. However, it is later revealed that his mother encouraged him to go to Tokyo to start a new life.