After Telligent platform upgrade from 8.5 to 10.3 $core_v2_urls.AddConversation($userId)) stopped working for normal user $core_v2_urls Widget Extension is

A normal registered  user is having everyone and registered user role assigned. after migration we are receiving false as response for following code

#set($stringResponse = $core_v2_urls.AddConversation($userId))

please let us know how can we fix that and set if any permission is required to initiate conversation. 

as expected passing userid should return the uRL as mentioned below

#set($stringResponse = $core_v2_urls.AddConversation($userId))