Added validations for external users & multiple providers by account
Added validations for external users & multiple providers by account

trustyknave/sorcery,NoamB/sorcery,Borzik/sorcery,Sology/sorcery,webgago/sorcery,Sology/sorcery,rubenmoya/sorcery,Sorcery/sorcery,jshum/sorcery,Borzik/sorcery,athix/sorcery,wendy0402/sorcery,ikhakoo/sorcery,creepycheese/sorcery,athix/sorcery,wasabia/bnbtripSorcery,jerefrer/sorcery,alexanderedge/sorcery,NoamB/sorcery,ikhakoo/sorcery,webgago/sorcery,alexanderedge/sorcery,trustyknave/sorcery,jerefrer/sorcery,wasabia/bnbtripSorcery,rubenmoya/sorcery,wendy0402/sorcery,creepycheese/sorcery,kristianmandrup/sorcery,Sorcery/sorcery,jshum/sorcery,kristianmandrup/sorcery,athix/sorcery,Sorcery/sorcery