Why can't I add the co-authors? Почему я не могу добавить соавторов?

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I past FB username to the form for it but the button "Apply" is inactive for some users. The usernames are right spelled. The users are logged to Spark AR Hub. What the problem? Maybe some permissions?
Asked about 6 months ago by Соня
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    • Roberto 647 answers

      Search for their name — either the name from their Facebook account or their Facebook username — and click Confirm.

      Only people who have logged into Spark AR Studio or Spark AR Hub at least once will appear in this search.

      If this is the case, as you mention, please open a bug report on the Hub and we'll look into it.