I have an issue where when I access the Marketplace, I get the message: Apps_Error_Cloud_Workspace_Access_Token_Expires_At is not set.
Can anyone asists withthis?
Your related issue is here.
First please tell us about your deployment.
https://gist.github.com/reetp#rocketchat---asking-for-help
Next, at a guess, you issue is either registration, general connectivity, or reverse proxy setup.
Make sure you tell us about them.