Cerrtain Users get UUID when saving work item after changing a specific field only

Hi Everyone,

I am running into a curious issue. I have three users (all members of a process role called "Technical Support") that are attempting to reassign work items by changing the "Owned By" field. When they go to save the work item, however, they receive the message:

invalid UUID [https://<server>:<port>/ccm/web/projects/_<seemingly_random_jibberish_that_doesn't_refer_to_any_project_area>].

They are able to add comments, update other fields, etc, and successfully save the work item. It is only when attempting to change the "Owned By" field that this issue arises. I have verified that members of their process role have the ability to modify ALL  work item attributes, so I can't imagine this is a permissions error. And yet, members of another process role (some group of managers) are able to update the "Owned By" field on the same tickets and save without issue.

I have seen a couple of other posts about being unable to save an entire project area because of an Invalid UUID error. The problem there seemed to be browser-related. As this only arises with one particular attribute, I can't imagine that's the case.

Has anyone experienced anything similar, or have any idea where I might be able to look for more info? If I have to provide some more details, I'm willing to do so, within reason.

Thanks,
- Josh