Error with discovery mailbox with Exchange Server 2016

salimhurjuk In Event Viewer I am getting the below Error Msg.

Failed to save admin audit log for this cmdlet invocation.
Organization: First Organization
Log content:
Cmdlet Name: Set-ExchangeServer
Object Modified: EXCH01
Parameter: Identity = EXCH01
Parameter: MitigationsApplied = PING1
Parameter: MitigationsAppliedTime = 18-11-2023 09:06:55
Caller: NT AUTHORITY\SYSTEM (Microsoft.Exchange.Mitigation.Service)
ExternalAccess: False
Succeeded: True
Run Date: 2023-11-10T09:07:14
OriginatingServer: EXCH01 (15.01.2507.034)

Error:
Exception thrown during AdminLogProvisioningHandler.Validate: Microsoft.Exchange.Data.Storage.ObjectNotFoundException:

The discovery mailbox, a hidden default mailbox that is required to search mailboxes, can't be found. It may have been inadvertently deleted. This mailbox must be re-created before you can search mailboxes.

at Microsoft.Exchange.Data.Storage.Infoworker.MailboxSearch.MailboxDataProvider.GetDiscoveryMailbox(IRecipientSession session)
at Microsoft.Exchange.Management.SystemConfigurationTasks.AdminAuditLogHelper.CheckArbitrationMailboxStatus(OrganizationId organizationId, ADUser& user, ExchangePrincipal& principal, Exception& exception)

salimhurjuk If your question is how to re-create the missing discovery mailbox you would start here: https://learn.microsoft.com/en-us/exchange/architecture/mailbox-servers/recreate-arbitration-mailboxes?view=exchserver-2016https://learn.microsoft.com/en-us/exchange/architecture/mailbox-servers/recreate-arbitration-mailboxes?view=exchserver-2016#re-create-the-microsoft-exchange-discovery-system-mailbox