Slack is no more supported by DeepOnion team.
As i can read, you dont get your signature in good shape, when you have request your apply. So bot just say no.
If you want to receive some AirDrop i recommend you to setup your signature as requested, show some activity on DeepOnion forum and open a Support Ticket.
According to support ticket I should not discuss in speculation forum and avoid joining other free airdrops. I like to discuss about crypto (deeponion is against free speech?) and have chance to get good returns from some other lucrative airdrops so I dont think its worth it. There is too much risk that I will just put more time into this without getting anything in return. Best of luck to those who did get into the Airdrop.
The signature was copy pasted directly from the DeepOnion page. Not sure how that could cause error, but I guess its possible too. Not a big issue but instead of blacklisting it would be better for the bot to give warnings so that people can fix it.