Hello Sarin,
Sorry to hear you are facing a problem.
Checking the description of the error, I believe you are being impacted by one of the following bugs:
1 - Create Issue without Browse Project triggers 404 on assignee field
The bug above happens when the assignee field is added to the create issue screen and the permission scheme is set with "any logged-in user" for "Create issue" and "Assign User", BUT DOES NOT include the Browse Project permission. Then, If the user creating an issue clicks into the Assignee field they trigger a pop-up error
2 - Assignee Field Shows Error With Project Key TRUE and FALSE
Happens when the project Key is configured as TRUE or FALSE
That being said, can you please try the workaround steps described at the bugs above and check if they work for you?
In case you are being affected by bug number 1, please vote and watch the bug to receive notifications about its fix implementation.
In case you are being affected by bug number 2, let us know and we will properly provide your feedback to our developers since it should be an obsolete behavior.
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