Hi @Serge - thanks for posting. It sounds like the Meross Garage Door device doesn’t implement at least one of the core capabilities that are presented during the authorization flow. Typically, garage doors show up under the ‘Which contact sensors?’ section.
If the device implements at least the Sensor or Actuator capabilities, it can be authorized manually as shown in the following post:
Another user reported the following workaround for Meross Garage Door Openers:
In the SmartThings classic app I added Virtual Device Creator in the Smart Apps tab and used it to create a dummy virtual switch called Garage Door. I then used IFTTT to make two applets to have Meross trigger the virtual switch on and off in SmartThings when opening and closing. I also made two more applets where the SmartThings virtual switch triggers Meross to open and close the door.