Add Key (Event) problem

Hi All. I fairly new to Unreal an blueprint. I created a blueprint in Unreal 5.1 and added a Key Frame (event) to level sequence. Created a variable of type Movie Scene Event which I connected to New Value pin on Add Key (Event) node. When I select Movie Scene Event type variable in Detail panel under Default Values I get Event field with value Unbound. The problem I have is that when I open the drop down menu I click on Create New End Point nothing happens. Can anyone please let me know why this doesn’t work and how I can bind event which I have in different blueprint with this key frame. PS: everything needs to be done in blueprint as I will be adding key frames at the beginning and then will be removing them at the end. Many thanks for any tips and clues.