Speedybee F4 V4 BLHeli Config

Hi guys
I just got the Speedybee FC and flashed the Ardupilot Firmware.
I can connect to Mission Planner.
However I cannot connect to https://esc-configurator.com/ to configure the ESCs.

Do i have to do something in the settings in Mission Planner or what did i miss?

Thanks

Probably several things:
ESC’s