I didn't sign out of icloud before I erased my old device

Welcome 1965_22_22,

It sounds like you forgot to sign out your iPhone 7 from Find My before erasing it. We'll do our best to assist.

For this, you'll want to take these steps: What to do before you sell, give away, or trade in your iPhone, iPad, or iPod touch

If you no longer have your iPhone, iPad, or iPod touch

If the steps above weren't completed and you no longer have your device, use these steps:

1. Ask the new owner to erase all content and settings using the above steps.

2. If you're using iCloud and Find My [device] on the device, sign in to iCloud.com/find or the Find My app on another device, select the device, and click Erase. After the device has been erased, click Remove from Account.

3. If you can't follow either of the above steps, change your Apple ID password. This won't remove personal information that's stored on your old device, but it prevents the new owner from deleting your information from iCloud.

4. If you're switching to a non-Apple phone, deregister iMessage. 

5. If you're using Apple Pay, you can remove your credit or debit cards at iCloud.com. Choose Account Settings to see which devices are using Apple Pay, then click the device. Next to Apple Pay, click Remove.

6. Remove your old device from your list of trusted devices.

These steps should help to remove the device from your account, so you can send it in.

Wishing you well, take care.