Hi Giovanni,
it looks like your account is locked, which occassionally took longer than 24h
Anyway: I recommend to check that connection is working fine again before enabling binding.
a) can you please remove all things and items related to Binding as well as remove .jar from addon folder to remove the binding
b) ensure that there is NO other installation which interacts with Landroid backend like iobroker, bridge, etc.
c) wait for having your account been unlocked and you are able to use positec app to manage/stear your Mower.
Important: Not only to recieve updates and work according available schedule (as this is working even account is locked) but also to start/stop mower manually
If this going to work properly (best case for 1-2 days) you may start to install binding and to configure things and items again.
Looking forward to your update 
Regards
int5749