Hi Justyne16,
welcome to this Apple (user-to-user) Community!
Re: "Trusted Device for icloud account How come I get a message: Trusted devices list is not available
when I try to sign back into my icloud account?
Wondering whether the phone number for your trusted device is available, or not, in your Apple Account ?
Your Apple Account is the account you use to access Apple services like the App Store, Apple Music, iCloud, iMessage, FaceTime, and more. It includes the email address and password you use to sign in as well as the contact, payment, and security details you use across Apple services.
if you need to add the phone number to receive verification codes::
Apple support's online article (link below) may help,
About trusted phone numbers and trusted devices for Apple Account - Apple Support
Eg says:
Add or change your trusted phone numbers
- On your iPhone or iPad: Go to Settings > [your name] > Sign-In & Security > Two-Factor Authentication.
Below the list of devices and phone numbers, tap Add a Trusted Phone Number.
- On the web: Go to account.apple.com, then click Sign-In and Security > Account Security.
In the Trusted Phone Number section, you can add and remove phone numbers.
There's much more info. if needed, in that linked article above.
Eg: You can scroll down to see what to do: :
"If you don’t have access to your trusted devices or trusted phone numbers"
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Re: " ... I’ve been locked out for 4 days now"
Locked out of iCloud, or your Apple Account ?
See what to do: If you can't connect or sign in to iCloud - Apple Support
or
If your Apple Account is locked, not active, or disabled - Apple Support
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If needed: How to: Get a verification code and sign in with two-factor authentication - Apple Support
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There's also an iCloud Support website (info. / support / contact options etc.)
(There is a "Get Support" link (online chat, phone, eMail etc) at the bottom of their webpage (link below):
iCloud - Official Apple Support