Folder Structure between MacBook and iPhone not syncing with iCloud Account on Outlook

I have set up the Outlook e-mail application on my MacBook and iPhone and I use several e-mail accounts that are integrated and synced well across my devices.

I am desperately trying to get the iCloud account to work seamlessly across the devices as well. It almost works now, being more or less synced with calenders and contacts etc.

I can send and receive emails and it syncs fine (i.e., when I have read an email on my MacBook, it displays as read on my iPhone).

Yet, I just can't get the syncing of the folder structure to work.

• On my MacBook and online (when I log into iCloud), the folder structure syncs fine
• On my iPhone, it displays some really old folder structure and is a huge mess. The changes made in my MacBook folder structure does not transfer onto my iPhone

Any tips on how to sync this? I have readded the account several times, I have tried to set up the account on my iPhone as an IMAP account, rather than directly through iCloud (but I receive errors, so I cannot set it up manually).

In the end, I just want that if I add/delete/move a folder on my MacBook, that it transfers onto my iPhone in the Outlook app.

Thanks for your help.

M