"We have reviewed your request, and access to your account has been denied."... But I never made a request.

See Jeff Donald's very comprehensive answer in this thread:

How to identify Apple ID scams via suspic… - Apple Community

Response to melovekitries

Yes , it's phishing , delete it . If your mail works fine then don't do anything .

In settings > apps > mail , privacy protections ~ turn on .

Load remote images ~ off .

This isn’t a scam - I received the same today, and tried to reactivate my account and it’s now been locked permanently without me asking for any of this.

Got onto Apple support, and they said they do not email in advance to let you know this will happen to you so you will no longer have access to that said account.

Ive read on other forums it’s due to inactivity but Apple doesn’t tell you in advance (in their t&c’s)