Instagram users commonly link their account with Yahoo mail and in case, if Yahoo Mail doesn’t work for Instagram then-
• You will need to ensure that the provided email address on Instagram is correct
• If there is even a single mistake then, correct it then and there and check if the problem persists
• Check if there is a good internet connection to receive emails from the Instagram server
• If nothing works then, you will need to force stop the Yahoo mail app and after that, re-enable it again to check if now you are able to receive emails from Instagram . contact number for yahoo mail uk