Dear EuphoricSquid
Thanks for using Microsoft products and posting in the community.
I can understand how you feel about the verification email not being received.
Often these third-party social media or gaming operators do not have their own independent CAPTCHA sending servers, but rather deliver them to independent vendors who are able to send CAPTCHAs in an integrated manner.
These independent vendors use code sending clusters to send large numbers of CAPTCHA emails quickly, which in itself can be flagged as an advertisement by mail relay servers.
In order to solve this problem, the server operator sending the emails deploys a large number of servers to avoid this problem, but if you are assigned to a server that sends anomalies, you will still experience problems with not being able to receive the CAPTCHA.
Therefore, you can wait for a few hours for the server to return to normal. Other than that, you can try to use other devices, such as other WINDOWS computers, to log in to your FACEBOOK/INS/website and resend the CAPTCHA.
Of course, if you are in a great hurry, you can give your account that needs to get the CAPTCHA to your trusted friends in other regions or cities, which will force the CAPTCHA server to switch to other server clusters and let them try to send the CAPTCHA, you may be able to receive the CAPTCHA again.
Hope the above information can give you reference.
I hope the above information can help you.
Looking forward to your reply.
Best wishes
Clark | Microsoft Community Support Specialist