I signed up on Appian last week, since then I can see the status that I will receive environment credentials on email, but nothing received, can you please guide on this.
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You will just have to wait. For any information you can send an email to communityedition@appian.com
They have been receiving a lot of requests and I think it is becoming difficult to process them on time. As Stefan said, you will have to talk to them about this.