two step authentications not being received in messages

Hey mrsmaamlady,

It sounds like you're having an issue receiving SMS authentication messages from accounts.

We'd recommend reviewing this article as it provides steps to help resolve SMS issues: If you can't send or receive messages on your iPhone or iPad - Apple Support

"If you still need help

• Try to restart your iPhone or iPad.
• Check your network connection. To send a message as iMessage or MMS, you need a cellular data or Wi-Fi connection. To send an SMS message, you need cellular network connection. If you turn on Wi-Fi Calling, you can send SMS messages over Wi-Fi.
• Check with your carrier to see if the type of message you’re trying to send, like MMS or SMS, is supported.
• If you’re trying to send group MMS messages on an iPhone, go to Settings > Messages and turn on MMS Messaging. If you don't see an option to turn on MMS Messaging or Group Messaging on your iPhone, then your carrier might not support this feature.
• Make sure that your device has enough space to receive images and videos.
• Make sure that you entered the correct phone number or email address for the contact."

As 2-step authentication messages are sent to your phone number through your cellular service provider as SMS messages, they would not use iMessage to be sent and received, this means that the issue is specific to your cellular service provider. We'd recommend reaching out to them for the best information and assistance on that.

Thanks!