Login to iCloud.com succeeds but immediately logs out.

had this myself going 6S to SE 3rd Gen, interference somewhere the service still thinking my 6s was logged in, so had to completely detach it and setup SE 3rd a second time which fixed it,

This is the troubleshout i used to step by step check everything, hope it brings you the solution bro! GL

The "login succeeds then logs out" loop on a new device after an iCloud restore often points to a few things:

1. Incomplete or Glitched Restore/Sync: The initial data transfer and sync with iCloud services might not have completed cleanly.
2. Network Instability: The Wi-Fi connection during or after the restore might be unstable.
3. iOS Glitch: A temporary software bug.
4. Old Device Interference (Less Likely, but possible): If the old device is still active and trying to sync.
5. Account Verification/Security: Sometimes, Apple's system needs an extra nudge to fully trust the new device.

Here’s what to try, in a rough order of ease:

Initial Quick Checks:

1. Force Restart Your New iPhone:

• • Press and quickly release the Volume Up button.
  • Press and quickly release the Volume Down button.
• Press and hold the Side (Power) button until you see the Apple logo.
  • Don't just turn it off and on; a force restart can clear more stubborn temporary issues.

1. Check Apple's System Status: Make sure all iCloud services are green: Apple - Support - System Status
2. Check for iOS Updates: Go to Settings > General > Software Update. Even if you just set it up, there might be a small incremental update available that could fix bugs.
3. Ensure Date & Time are Correct: Go to Settings > General > Date & Time. Make sure "Set Automatically" is ON. Incorrect date/time can break iCloud authentication.

“Transfer was performed in the Verizon store. However, this problem occurred at least once prior to upgrading the phone.”

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I’m not aware of what methods Verizon goes through to perform the transfer. But, a backup -> factory reset -> Quick Start transfer would fix this. So give it a go. Thants how I would have gone about this.

"Login to iCloud.com succeeds but immediately logs out.: When I try to login to icloud.com on Chrome or Safari on Windows11, the login succeeds, but I'm never prompted for a 'verification code' on my phone. Icloud.com displays the main screen, but immediately is logged off. Recently upgraded iPhone12 mini to iPhone16, copying from an iCloud backup."

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Updating to a New iPhone:

Use Quick Start: How did you perform the update? Was it manually transferring this? Quick Start is a service provided by Apple for transferring to a new iPhone. So, you should backup your iPhone to a computer(Mac or PC), and then reset your new iPhone to Factory Settings. Once Factory Reset, perform Quick Start.