Hey,
This can happen out of the blue sometimes, often its due to a smaller email provider being the receiver and certain filters and security measure conflicting with the emails.
The best advice I can give is to use a different email address to receive emails from Bungie, specifically one from a big provider e.g. Gmail or Outlook.
You can also add a forwarding option to these if you still wish for the email to go to your original address.
Hope this helps!
English
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i'm using Yahoo and have the same issue, its strange because has some other people with gmail and other big providers with the same issues