Hello, sounds like this:
https://help.bungie.net/hc/en-us/articles/24217906958868-Date-of-Birth-Requirements-for-Destiny-2-and-Bungie-Services
English
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Thanks, but I don't thinks that's it, since I'm already set as his parent @ Bungie.net. Plus, I cannot find anywhere where to fill in D.O.B. now.
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No clue. Try resetting everything. (The strictest setting and then give him full access again)