Staff leavers still appearing in the Staff notebooks

Hello everyone,

We had several staff members leaving our company and all their accounts have been permanently deleted. However, when we open some Microsoft Staff Teams which were created via SDS (Microsoft School Data Sync) and take a look at the related Staff Notebooks, we see that their names are still in the list just after the "_Content Library". As the "Add/Remove Staff" option doesn't work on those notebooks, is there another way to remove those name sections from the notebooks? I thought that they would have been automatically removed together with the deleted accounts, but they are still there.

Any ideas?

Many thanks in advance

Francesco