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Hello, i have setup a new enviroment and add now the exchange to it.

Now when i want create the first mailbox i get following error

Error creating mailbox. See audit log for more details.

Server was unable to process request. —> Error executing ‘CREATE_MAILBOX’ task on ‘admin’ EXCHANGE —> Server was unable to process request. —> Connecting to remote server mail.mywebsite.net failed with the following error message : [ClientAccessServer=SOLIDCP-MX-01,BackEndServer=,RequestId=a3643cb1-5c9f-4f0a-bc1f-97c9fec39d0c,TimeStamp=9/10/2019 8:53:27 AM] Access Denied For more information, see the about_Remote_Troubleshooting Help topic.

At the Audit log i have following :

00:00:00
Account Name: admin00000

00:00:00
Display Name: admin

00:00:00
Account Type: Mailbox

00:00:00
Org ID: 10

00:00:00
Org Name: bild.de

00:00:00
EXCHANGE_GET_EXCHANGE_MAILBOXPLAN

00:00:00
Server was unable to process request. —> Connecting to remote server mail.mywebsite.net failed with the following error message : [ClientAccessServer=SOLIDCP-MX-01,BackEndServer=,RequestId=a3643cb1-5c9f-4f0a-bc1f-97c9fec39d0c,TimeStamp=9/10/2019 8:53:27 AM] Access Denied For more information, see the about_Remote_Troubleshooting Help topic.
at System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage message, WebResponse response, Stream responseStream, Boolean asyncCall)
at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters)
at SolidCP.Providers.Exchange.ExchangeServer.CreateMailEnableUser(String upn, String organizationId, String organizationDistinguishedName, String securityGroup, String organizationDomain, ExchangeAccountType accountType, String mailboxDatabase, String offlineAddressBook, String addressBookPolicy, String accountName, Boolean enablePOP, Boolean enableIMAP, Boolean enableOWA, Boolean enableMAPI, Boolean enableActiveSync, Int64 issueWarningKB, Int64 prohibitSendKB, Int64 prohibitSendReceiveKB, Int32 keepDeletedItemsDays, Int32 maxRecipients, Int32 maxSendMessageSizeKB, Int32 maxReceiveMessageSizeKB, Boolean hideFromAddressBook, Boolean isConsumer, Boolean enabledLitigationHold, Int64 recoverabelItemsSpace, Int64 recoverabelItemsWarning)
at SolidCP.EnterpriseServer.ExchangeServerController.CreateMailbox(Int32 itemId, Int32 accountId, ExchangeAccountType accountType, String accountName, String displayName, String name, String domain, String password, Boolean sendSetupInstructions, String setupInstructionMailAddress, Int32 mailboxPlanId, Int32 archivedPlanId, String subscriberNumber, Boolean EnableArchiving)

i have running a split DNS and access the mail server with the same internal / external name  ( Create a DNS Record to resolve the external as intertnal name )
I have only problems when i create a mailbox, no issue with creating users or some other.

Answered question