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hmmmm maybe its due to the age of it? not sure, I know I had issues using protonmail myself when I first started joing slacks for other coins. Could be a blacklisted account like my protonmail was but unsure. Sorry for making jump through hoops lol...that is why I got my buddy over at PIVX to setup the auto invite confirm setup to make it easier, guess its not working on all spectrums as I hoped lol. I will ask him if he is around today. Maybe try setting up a gmail account, I know that worked for me