Is there anyone connect successfully plantlink to SmartThings App?

I have a Plantlink and connected it to the Smartthings Hub. I try to connect Link to smart app myPlantLink flow “OSO Technologies PlantLink Soil Moisture Sensor”. But it has some differences from instruction. In the last step, one error occurs “An unexpected error occurred”. So what I need to do to fix that?

I am seeing the same problem at the end of the smart app setup… “An unexpected error occurred”. Has anyone figured out a solution?