How to resolve iCloud sync issue with two Apple IDs and an unknown passcode?

"How to resolve iCloud sync issue with two Apple IDs and an unknown passcode?: i have two Apple ID ’s, one corporate and one personal. My corporate iPhone keeps saying it can’t sync some iCloud data because I don’t know the 6 digit passcode for my ‘other’ phone . But I haven’t had another phone for years and don’t know the other passcode. What can I do?"

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iCloud Requiring a Passcode from a Device:

You are referring to an Apple Account here ("Apple ID" is no longer used by Apple). So, talk with your company. You need to remove that iPhone from your Apple Account and then add another device permission to access it their data on their Apple Account. So, ask your company to permit another device for syncing. If that this is on you, then go here, and see if you can remove it from your Apple Account: Remove a Device from Find Devices on iCloud.com - Apple Support

“I have logged into my corporate apple account and there is only one device shown. But I am still being asked to verify the 6-digit passcode used to unlock my ‘other’ phone. But I haven’t had any other phone for over 10 years and do not know the code . What can I do?”

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So, what about this OTHER Apple Account? Is it seen in there?

As for the PIN, I’ve noticed over-the-years that users tend to admit to using their bank PINs. That is something unwise, but it solves it for quite a few. PINs are six digits; so, they’d have had to have added two 0s in front of it. Sometimes, it’s all 0s.

If you have your own device, ask your employers you can add that to your account.

I have logged into my corporate apple account and there is only one device shown. But I am still being asked to verify the 6-digit passcode used to unlock my ‘other’ phone. But I haven’t had any other phone for over 10 years and do not know the code . What can I do?