@anne_hh You’re so fast 
Binding is now updated on Marketplace.
It fixes the problem with authorization which is reflected in HTTP error messages with code 412 and 418. Users who passed the auth process everything should be fine.
For new users the above mentioned auth process is not working anymore!
Mercedes discontinued the PIN approach so you won’t receive an email anymore as described in readme. They’re using now also a captcha to avoid non-human data access - BMW users know this pain - thanks for that Mercedes!
I’m already in contact with Home Assistant & ioBroker developers to deliver a common solution.