Edit permissions option in the ECP can't be edited

Symptoms 

When you try to edit public folder permissions by using the Exchange Admin Center (ECP), the ECP returns a serialized object that cannot be modified. Additionally, it returns the following error message: 

Resolution 

To fix this issue, install the following update, as appropriate: 

• For Microsoft Exchange Server 2019: Cumulative Update 14 for Exchange Server 2019 or a later cumulative update for Exchange Server 2019

• For Microsoft Exchange Server 2016: Hotfix update for Microsoft Exchange Server 2019 and 2016: April 23, 2024 (KB5037224)