Support reps cannot access BU

Support reps cannot access BU

I have created 2 new BU's and assigned 7 support reps to the BU's.
Now none of the new support reps are able to see their assigned BU.

They are contacts in other BU's and they can see these BU's without any problem, this must not change.
How can i ensure that the Support Reps can access the required BU's

I am on Version: 8.0.0 Build Number 8009

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