Why does it says unable to accept invite?, Did I get banned or something?

did i get banned or something?, i can't join it says unable to accept the invite

I don't see a afterwords page, this isn't the last chapter right?, Please tell me it isn't

I'm starting to worry about Negom (some of you might know her from her Ganyu x Keqing and Hugtto PreCure doujin), she apparently keep getting attack on Twitter, anyone's know why she deserved it?, It's truly saddening to see an artist suffered like this especially a yuri artist.