Family Sharing: Deleted accounts still count towards limit

Hello,

i've got a question about family accounts.

We are a family of five, and due to various circumstances, we filled up the family members up to the 6 authorized account. (Kids losing their account, having to duplicate accounts etc...)

Now I want to clean up these accounts to set our family sharing properly, I've deleted the duplicated accounts.

They disappeared properly from the family group, but I'm still blocked if I want to add a new clean account.

Because the systems considers that my family is already filled with 6 people. But 2 of them are deleted.

On the family sharing menu on my mac, I see 4 people (the actual existing account), but I cannot add the fifth one, because it looks the deleted accounts haven't been removed from our family.

How to solve that ? Any advice would be kindly appreciated.

Thanks in advance