ScreenshotCan you attach a screenshot?
iAt iCloud dot com NO devices are setup with the account shown on the iPhone iCloud account. In fact have never used iCloud, just set it up and had a look see.
ScreenshotView attachment 747815
Your screen shot looks to me like it's locked to that iCloud account, and would unlock with the right password for that account. When you went to iCloud.com and looked for devices, I assume you actually logged in there with the account and password shown in your screenshot. If that's true, meaning you know the iCloud account and password, then as already suggested, you should call Apple support.