Error message by creating shared mailbox Exchange 2016

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received an error message during the creation of a new shared mailbox.
The shared mailbox was created despite the error message.
it happens only when adding send as permissions to new shared mailbox
we host the exchange server 2016 on premise and latest CU is installed
Exchange Server is installed in an Forest with 18 Domains and 46 Domain Controllers.
Looks like an issue regarding not connecting to correct DC while trying to set up Active Directory Based Send AS Permission on new Shared Mailbox

help would be welcome :)

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