From yesterday on wards, there has been an issue through Facebook to send and ask for lives. It is affecting all the King games AND non-king games too!
Out King team are aware about it and are working with the Facebook team to fix the issue as soon as possible. I guess we just have to be bit patient for next couple of days!!
Hope this clarifies why the problem is appearing! Please let me know if you need further assistance / clarifications!
Talk to you soon! Have a wonderful rest of the day/evening!