I've suggested that the message should be clearer because I assumed that 'user is banned' was referring to the user I was trying to share the folder with. I've also suggested that it should be possible to see that you have been banned from sharing in your account setttings, with perhaps an explanation of why your banned and an option to request the ban is lifted. I also experienced a related issue when I trying to create a link for sharing the folder and that produced no error but did't generate the link. I can only assume that the cause of this was the same because it works now. There should be a suitable message displayed when trying to create a link for sharing a folder if you are banned.
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