Changing a demo user name

When changing a demo user name (project > security > demo users) and deploying the app in the free Mendix cloud (sandbox environment) does not seem to work anymore. Apparently, the old name is still remembered/stored because logging in with the old name still works. How could this be caused?   BTW. When deploying the app locally, changing the demo user name DOES work...   Thanks for your help!
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