I'm sorry not to know anything about the enrollment key page, but I'm betting your support person needs to have a role on the Moodle front page, which makes the person visible to all users. Otherwise, the usual rule is that a person can't be seen until a user is enrolled in a course.
Re: Setting up a site support user - details not available to users
{$a->নাম} - {$a->তারিখ} দ্বারা
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