Can't replace disk in existing StoragePool

Hello,

I can't replace hard disks in my existing StoragePool, it fails when adding new disks.

I had the following drives in the pool

First I marked three of the 3TB disks as retired and after the data was moved (Checked via Get-StorageJob) I removed three disks from the pool without error message.
Then I plugged in the three new hard drives and tried to add the disks to the pool.

But here I get the error message that the operation is not supported.

I can't find any further information and can't find the reason why adding a bigger disk is not supported.

Does anyone have an idea how I can solve this?