Im not able to get a shared folder shared to 2 employees.

When they receive the shared folder and try to accept it a dialog; saying
that the folder was not specifically shared to them, comes up.

These 2 belongs to another PO than me. But several persons from that same
PO can accept and "import" it.

I've tried sharing different folders from different accounts, resources
etc. but the specifically shared folder keeps stopping them from accepting it.

I've ran GUID checker on my PO and all seems to be fine. Colleagues at the
other PO has done the same there.

I've run all kinds of Library checks but no change.

Any ideas folks?