Two-step verification increases the security of your account. But having to enter the code for each login can be annoying. Google uses a better method. After entering your Gmail address and password, a Google message will be displayed on the device where your phone number is linked to Gmail. In this message from Google, you will be asked if you are the one who wants to access the account. Also confirm this entry by clicking the “Yes” button. So if you didn't receive the Google Account Verify, it may be because you clicked the "No" button in response to this message from Google.

The problem is related to the Google service.
The Google service may not be available when you submit a request to obtain the codes. Therefore, no code will be sent to you and you will need to wait until this issue is resolved and submit your request again.

You do not have an active plan
Google does not send a verification code because you have not activated your service plan. After activating the service plan, you must also enable receiving messages from this service. Otherwise, you will not receive notifications sent by Google.

Use a new device to sign in to your Gmail account
If you have tried to log in to your Gmail account using a computer or mobile phone that you have never used, you may encounter this problem.

Delay in receiving codes.
Sometimes, due to reasons such as your location or the speed of sending codes, codes sent to you by message or email may be delivered to you with a delay.

Your Internet connection is poor.
If you have a weak network connection, you will not be able to receive verification codes.