Issues Adding Users to Free Account on Fly.io and Arize Integration

Hi, I asked this yesterday in the wrong channel, sorry for duplicating here... "Hi, new user here, lead data scientist at Graphext. I'm currently evaluating deployment of our user's models on platforms like Fly.io via a simple FastAPI prediction server, and integrating observability platforms/APIs like Arize (and whylabs etc.) into our own server (such that predictions get automatically logged to Arize e.g.). I'm currently facing a simple problem, in that I can't seem to add users to an account and/or organization or workspace, on a free account that is... When I try the "New user option", I get a message that the user already exists, and if I try the "Existing user" option, the email is not found in the auto-completing user drop-down Any idea what might be preventing me from adding users?"