Contact - Microsoft Support
COMMUNITY ANSWER Follow these steps to troubleshoot when Microsoft verification codes do not arrive by email or SMS: Check where the code is being sent Verification codes can only be sent to the primary alias or an email/phone that is already added as a security method.

Microsoft account security info & verification codes
Learn how to manage your Microsoft account security info and troubleshoot verification code issues.

I can't sign in to my Microsoft account - Microsoft Support
If you have forgotten your email or username, learn how to Look up your Microsoft account. If you have issues with getting verification codes, read our troubleshooting steps. Steps to recover your Microsoft account If you know your username but it's not recognised anymore, read My username has stopped working.

Troubleshoot NAT errors and multiplayer game issues
Find a solution if you can't hear friends, can’t join or host a multiplayer game online, or are getting a NAT related error on Xbox.

Common problems with two-step verification for a work or school account
There are a number of possible explanations for why verification codes don't always arrive. Read through the list of the most common causes, and see if any of them apply to you.

I am not getting verification codes - Microsoft Q&A
If you don’t receive a verification method, it could be due to several reasons. You might be temporarily blocked because of unusual activity, repeated code requests, your phone or email blocking messages from unknown senders, or a full inbox. I suggest that you check if your inbox is full.

troubleshooting verification code issues - Microsoft Q&A
Based on your post regarding "troubleshooting verification code issues".To understand the situation and be able to offer you relevant suggestions, we would need a little more information from you.

We're sorry that you're having issues with Microsoft account ...
If you're not receiving the verification code for your Microsoft account, there are several steps you can take to troubleshoot the issue: Check Your Phone Number: Ensure that the phone number associated with your account is correct. You can check this in your account settings.

Not getting verification code - Microsoft Q&A
As there are a number of possible explanations for why verification codes don't always arrive. You can follow the steps to fix this by troubleshooting verification code issues in the mentioned link: Troubleshooting verification code issues - Microsoft Support

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