or-else
commented
6 years ago It's rather a feature than a bug.
When starting a new topic, by default one sees a list of contacts. That list is supposed to be created by importing contacts from the mobile phone: the imported contacts are stored in the fnd.private field and the search for contacts is executed automatically on the server. In the same screen one can search for additional contacts by setting fnd.public field. The results of those searches are transient - they are not added to the list of permanent contacts and the value of fnd.public is not saved.
In the Group Management screen one is searching on the client through the contacts returned by the most recent fnd query. In other words, one can only invite people who he already knows. This is the logic followed by WhatsApp. Telegram does the same plus searches server-side for partial matches of user handles.
pwFoo
Searching user by name / email / UserId fails if I try to add a user to a group.
No log entry during searching for User. No contacts found.