HELP! I just opened a Developer account, and now need to be able to convert everything to that account. I thought I could just change my info in the Setup, but it's saying that there is already a user with that name.

As I understand it:

I have an admin account within my org, which is connected to POU Hub.

I have a devel account separate from my org, that I would like to use in the org, and also the POU Hub.

Is there a way to merge the two without losing data?