can't add user in Skype groupchat using Ubuntu-based OS

[vengeanceismine]

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the scenario, there are already plenty of users that belongs in Skype groupchat using Ubuntu OS


however, there are user(s) that can't be added in the said Skype groupchat ... like once the user is added in the Skype groupchat, it will immediately or automatically leave the group without even prompting the said user if it wants to leave or continue to be in the groupchat

[salbahis]

user limit in a group conversation/call for free account is 10 user... 5 is recommended by microsoft for better quality...