How are you trying to select the user? What does that do when you select one?
I go to adminsiter project and tried to change the project lead there and it gives me an error. check screenshot
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Ok, can you test that they're assignable?
Go to an issue in the project and click assign - is Eric a viable option there?
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The issue was the user name had a upper case. Atlassian support just respnded back. So the solution is to go change the user name to lower case and that resolved the issue.
Thanks for the help though @Nic Brough -Adaptavist-
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Ah, finding Eric in the assignee list would have got us to "case sensitive" after another step. Glad you got there faster though!
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