Solutions I've seen thus far are for server . . .
As far as I'm aware you can't achieve that in cloud due the fact that atlassian does not allow customizations in their environment like you can do it with server .
You can raise a support case to atlassian at https://support.atlassian.com to confirm, however I'm pretty sure there's no way to get that.
Thanks and Regards,
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Why do you want to prevent a user from changing their password?
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