SmartThings error 31-164 of air conditioner

Hello,
My air conditioner (3,5 kW AR12KSWSBWKNZE) always shows offline.

I removed it and tried to add it again.
Fails.
Registration also gives error code 31-164 on both the iPhone 12 Pro and Samsung S20 FE.

On one occasion the tooltip said it might not be mine on the device.

I wrote to support, but they don’t respond
Thank you in advance!

Hello ,

Im having exactly the same problem with my MIM-H03 device ( my interface for A/C multisplit) .

My issue started with a offline device and then o tríed to reset the conection . When i tríed the registration again, the smarthings app cant register my device and the proccess cant finish .

Hello,
I am writing to ask if your problem with registering your air conditioner has now been resolved.
I live in France and I have the same registration incident as you (31-164) for the same model of air conditioner.
If your incident is resolved, can you please tell me the solution implemented ?
I thank you in advance for your response.