Unable to set permission using ECP. Error 5 Multiple objects with Sid S-1-5-32-544 were found

[Gernot_Meyer]

Hi all,

we are using Exchange 2019 on prem and since a week we are unable to set mailbox permission using ECP in any mailbox: We can open mailbox details but when choosing mailbox delegation, a popup "try again later" is logged. also Event 5 in eventlog is raised with "Multiple objects with Sid S-1-5-32-544 were found".

Powershell is working!

I checked all mailboxes getting permission detailes but I am unable to find any problem.

Any hints?

[#2]

Hi @Gernot_Meyer 

try below command and check again 

net stop MSExchangeIS
net start MSExchangeIS
iisreset

If I have answered your question, please mark your post as Solved

If you like my response, please give it a Like 

Appreciate your Kudos! Proud to contribute! :)

[#3]

Hi@Deleted and thanks for answer.

Server has been rebootet. So that doesn't solve.

[#4]

Maybe try removing the orphaned SIDs from the mailboxes.

Have a look at http://aapbde.blogspot.com/2020/11/find-035-orphaned-sids-and-remove-them.html