@Oh-Rocky Hey there! Unfortunately, you are not able to just create a custom match at your own discretion. There are rules and regulations pertaining to custom codes, as well as an application process. Check out the link down below, that has some great tips on ways to better your odds of being approved, as well as the contact email that you will need to submit your application to. Try to make the application as polite and professional as possible. Best of luck to you!
https://www.ggrecon.com/guides/apex-legends-how-to-make-a-private-match/
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