This might seem strange but a customer of ours sent a bunch of invites to their users. Only 20% of the users managed to register. This was because they just tried to login without having an IBM ID (I'm not sure what credentials they used) when of course they should have signed up for an IBM ID first but it wasn't obvious to them.
It may be worth considering changing the landing page from a space invite or DM to be more intuitive like:
"Have you used Watson Workspace before?"
Yes - sign in with your IBM ID
No - sign up, get an IBM ID and access to Watson Workspace
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