It looks like you are trying to change you name in your Atlassian account settings.
If you aren't already, try doing it at the following URL: https://id.atlassian.com/profile
When I visit the page, I notice that it loads with fields disabled. They only become enabled once the page is fully loaded (in particular after loading content from marketplace-cdn.atlassian.com). So you might check if the page is loading fully for you, in case ad-blocker or firewall is preventing.
Hope that helps.
Sam
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