Hi @klimadamenko
Could you kindly check with the Host of the meeting and find out if you're actually invited to this meeting.
If you were not invited by the Host, then just by using the SIP URL, you can't join the meeting. And, only during such situation - we receive this error.
Ask the Host of meeting to send you a meeting Invitation first and once done, accept the invitation from your side.
Now, you go to JS SDK Test URL and Authenticate yourself and finally just click on webex.meetings.syncMeetings() button. You should be able to find a new button there with meeting.join() [object Object] text on it.
You don't need to provide the SIP URI there to join the meeting anyway.
Please let us know for any further assistance on this.
Regards,
Sandip