Hello,
The cause of this can have several reasons such as: No permissions, expired certificates or the account which is loading the MMC console is not the right account. Local user login + enrollment using MMC / cert manager console will not work. These errors you are mentioning are probably caused by opening the certificates snap-in with the wrong account. Try to reopen with the correct account.
There is an enrollment scheduled task built-in you can try to run it manually. The certificate enrollment request should run in "System" context if you are using the LDAP enrollment method.
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