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To resolve your issue with accessing your Office 365 business accounts due to not receiving authentication codes, you can follow these steps:

1. Use Alternative Verification Options: If you have set up other options for security verification, select Other verification options during the sign-in process and try again using a different method.
2. Check Your Phone Numbers: Ensure that your phone numbers are correct in your user account settings. You can ask another global admin in your organization to verify this for you.
3. Contact Support: If the above steps do not work, you may need to contact Microsoft 365 Support for further assistance. You can find the support phone number for your region at the Microsoft 365 admin support page.
4. Reset Your Password: If you are unable to sign in, consider resetting your password using your security information, if this feature is enabled by your global admin.

If you are the only global admin and cannot resolve the issue, contact the Azure Data Protection team for help.

References:

• Troubleshoot sign-in issues and account access problems
• Get support for Microsoft 365 for business