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MQ_ERROR_NO_INTERNAL_USER_CERT
The current MSMQ identity lacks its internal certificate
MQ_ERROR_NO_INTERNAL_USER_CERT () means secure MSMQ operations cannot find a usable internal user certificate/private-key pair for the actual sending/account context. It is not equivalent to queue access denied.
Evidence to capture
Record effective account, MSMQ certificate registration, user/machine store location, certificate validity, private-key provider, and key access under that identity.
Focused correction
Create/register the supported MSMQ user certificate or restore access to its private key under the correct account, then retry without changing queue ACLs.
Technical references
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