IMAP-Einstellungen Exchange 2019

[PS] C:\Windows\system32>Get-IMAPSettings -Server ex2019 | fl


RunspaceId                        : a6c63a29-7cca-4b4e-ae4e-d216a65a206f
ProtocolName                      : IMAP4
Name                              : 1
MaxCommandSize                    : 10240
ShowHiddenFoldersEnabled          : False
UnencryptedOrTLSBindings          : {[::]:143, 0.0.0.0:143}
SSLBindings                       : {[::]:993, 0.0.0.0:993}
InternalConnectionSettings        : {ex2019.domain.local:993:SSL, ex2019.domain.local:143:TLS}
ExternalConnectionSettings        : {}
X509CertificateName               : mail.domain.de
Banner                            : The Microsoft Exchange IMAP4 service is ready.
LoginType                         : SecureLogin
AuthenticatedConnectionTimeout    : 00:30:00
PreAuthenticatedConnectionTimeout : 00:01:00
MaxConnections                    : 2147483647
MaxConnectionFromSingleIP         : 2147483647
MaxConnectionsPerUser             : 16
MessageRetrievalMimeFormat        : BestBodyFormat
ProxyTargetPort                   : 1993
CalendarItemRetrievalOption       : iCalendar
OwaServerUrl                      :
EnableExactRFC822Size             : False
LiveIdBasicAuthReplacement        : False
SuppressReadReceipt               : False
ProtocolLogEnabled                : False
EnforceCertificateErrors          : False
LogFileLocation                   : D:\ExchangeServer\Logging\Imap4
LogFileRollOverSettings           : Hourly
LogPerFileSizeQuota               : 0 B (0 bytes)
ExtendedProtectionPolicy          : None
EnableGSSAPIAndNTLMAuth           : True
Server                            : EXCH
AdminDisplayName                  :
ExchangeVersion                   : 0.10 (14.0.100.0)
DistinguishedName                 : CN=1,CN=IMAP4,CN=Protocols,CN=EX2019,CN=Servers,CN=Exchange Administrative Group
                                    (FYDIBOHF23SPDLT),CN=Administrative Groups,CN=MeinSever,CN=Microsoft
                                    Exchange,CN=Services,CN=Configuration,DC=domain,DC=local
Identity                          : EX2019\1
Guid                              : e24e8403-506c-4f2b-96d3-266b0431b240
ObjectCategory                    : domain.local/Configuration/Schema/ms-Ex2019-Protocol-Cfg-IMAP-Server
ObjectClass                       : {top, protocolCfg, protocolCfgIMAP, protocolCfgIMAPServer}
WhenChanged                       : 10.08.2021 06:13:40
WhenCreated                       : 09.08.2021 08:53:08
WhenChangedUTC                    : 10.08.2021 04:13:40
WhenCreatedUTC                    : 09.08.2021 06:53:08
OrganizationId                    :
Id                                : EX2019\1
OriginatingServer                 : dc.domain.local
IsValid                           : True
ObjectState                       : Unchanged

An den Rechten kann es nicht liegen: die Exchangeeigene PS wird mit Admin-Rechten gestartet und der Benutzer ist auch Organisations-Amin und beide IMAP-Dienste laufen.
Fehlen vllt. irgendwelche Komponenten? Hier eine Liste der installierten Komponenten:

Server            Component                  State
------            ---------                  -----
ex2019.domain.local ServerWideOffline          Active
ex2019.domain.local HubTransport               Active
ex2019.domain.local FrontendTransport          Active
ex2019.domain.local Monitoring                 Active
ex2019.domain.local RecoveryActionsEnabled     Active
ex2019.domain.local AutoDiscoverProxy          Active
ex2019.domain.local ActiveSyncProxy            Active
ex2019.domain.local EcpProxy                   Active
ex2019.domain.local EwsProxy                   Active
ex2019.domain.local ImapProxy                  Active
ex2019.domain.local OabProxy                   Active
ex2019.domain.local OwaProxy                   Active
ex2019.domain.local PopProxy                   Active
ex2019.domain.local PushNotificationsProxy     Active
ex2019.domain.local RpsProxy                   Active
ex2019.domain.local RwsProxy                   Active
ex2019.domain.local RpcProxy                   Active
ex2019.domain.local XropProxy                  Active
ex2019.domain.local HttpProxyAvailabilityGroup Active
ex2019.domain.local ForwardSyncDaemon          Inactive
ex2019.domain.local ProvisioningRps            Inactive
ex2019.domain.local MapiProxy                  Active
ex2019.domain.local EdgeTransport              Active
ex2019.domain.local HighAvailability           Active
ex2019.domain.local SharedCache                Active
ex2019.domain.local MailboxDeliveryProxy       Active
ex2019.domain.local RoutingUpdates             Active
ex2019.domain.local RestProxy                  Active
ex2019.domain.local DefaultProxy               Active
ex2019.domain.local Lsass                      Active
ex2019.domain.local RoutingService             Active
ex2019.domain.local E4EProxy                   Active
ex2019.domain.local CafeLAMv2                  Active
ex2019.domain.local LogExportProvider          Active