unable to get verification code for apple ID.

From: Get a verification code and sign in with two-factor authentication - Apple Support

A code is sent first to your trusted devices automatically:

"If you have a trusted device running iOS 9 and later, OS X El Capitan and later, iPadOS 13 and later, or watchOS 6 and later, the verification code is displayed automatically on your trusted devices."

If you don’t have a trusted device handy, you can choose to have a verification code sent to your trusted phone number as a text message or phone call.

1. Click "Didn't get a verification code" on the sign in screen.

2. Choose to have the code sent to your trusted phone number.

3. You'll get a text message or phone call from Apple with your verification code. This text message might include an additional domain validation line. This line includes the @ symbol, the website name, and your code (for example: @icloud.com #123456 %apple.com).

4. Enter the code on your other device to complete sign in.

"If you can’t receive a verification code on your trusted devices automatically, you can get one from Settings, even if your device is offline."

On a mobile device go to Settings > [your name] > Tap Password & Security > Get Verification Code.

On a Mac: Go to Apple menu  > System Preferences [System Settings], then click Apple ID. Click Password & Security > Get Verification Code.

"If you can’t sign in, reset your password, or receive verification codes, you can request account recovery to regain access to your account [ How to use account recovery when you can’t reset your Apple ID password - Apple Support ]. Account recovery might take a few days or longer, depending on the specific account information you can provide to verify your identity."

You get the "too many" message because Apple is sending the codes but for some reason you aren't seeing them. Typically that may be because you have changed your telephone number and have an old one in your security settings. After a while Apple gives up for a period of time (I don't know how long - you'll just have to try later), probably thinking you are a hacker trying every possible telephone number in the world until you get the right one.

If you can still sign into your account on another device you can investigate adding more ways to get a code such as multiple telephone numbers where you can receive a text or a phone call. This is based on the section "About trusted phone numbers and trusted devices" in the article: Two-factor authentication for Apple ID - Apple Support

To see, add, or change your trusted phone numbers use one of these methods:

● On your iPhone, iPad, or iPod touch: Go to Settings > your name > Password & Security. Next to Trusted Phone Number, tap Edit.

● On a Mac computer choose Apple menu  > System Settings (or System Preferences), then click your name (or Apple ID). Click Password & Security, then add or remove a trusted phone number.

● Using a web browser:

1) Go to https://appleid.apple.com and sign in.

2) Follow security options until you find one letting you change trusted numbers,

3) Click "+" to add a new number (you may be required to verify this number).

4) If you wih to remove an old number, click "-" next to the number.

None of these directions are correct. iPad settings, your name there isn't 'password & security. iMac system settings click name /appleid there isn't a password & security

I have just acquired a refurbished MacBook Air. When I try to sign in to iCloud it tells me that a number has been sent to my trusted devices, which is my iPhone running iOS 16, but it does not arrive and getting a verification code through settings doesn't work either. Unfortunately I no longer have the phone which has my trusted number. What else should I do, please.