Hi Ricardo Castillo,
Welcome to the Microsoft Q&A forum.
From your description, emails from accounts.nintendo.com are not appearing anywhere (even after you added the domain to Safe Senders and created rules), which suggests the messages may not be reaching the mailbox in the first place. I understand how disruptive that is when you are expecting time‑sensitive messages.
The Q&A Assist answer above is generally on the right track for ruling out common Junk/blocked/rule settings. Have you had a chance to try those suggestions, and did any messages from this domain show up in any folder afterward?
One additional note: Outlook rules can only act on messages that are actually delivered. When nothing from a sender appears anywhere, it usually means the filtering is happening before the message reaches the mailbox, which is not something that can be examined from the client side or within this forum. In that situation, the most direct next step is to contact Outlook.com support through the built‑in Help pane so the mailbox delivery side can be reviewed:
- Go to Outlook.com and sign in.
- Click the Help icon (question mark) in the top right corner.
- In the Help pane that opens, type a brief description of your issue (e.g., "cannot receive emails"), then press Enter.
- Scroll down the page until you see "Still need help?", click Yes.
- Select "Chat with a support agent in your web browser."
- Review the description of your issue and confirm your email address (ensure it's an email you can access).
- Click Confirm to create the service request and then Start chat to connect with an agent.
Reference: How to get support for Outlook.com - Microsoft Support
I hope this helps narrow the next step in the quickest way.