The account manager requests that the account is locked
This sounds wrong to me because "request" isn't usually paired with the simple present tense.
The Proper Sentence
Below is the pattern for "request":
X requests that [Y (active verb phrase in bare infinitive form)]
X requests that [Y is (passive verb phrase in to-infinitive form)]
Note that the "bare infinitive form" is the just the conjugated verb (e.g. "eat", "walk", "sleep") vs. the "to-infinitive" which includes the verb to (e.g. "to eat", "to walk", "to sleep"). Therefore the proper sentences are:
The account manager requests that we lock the account
The account manager requests that the account is to be locked
- For the active verb version, it is possible to drop the word "that", dependent on dialect/personal choice. Dropping "that" feels slightly archaic to me.
The account manager requests we lock the account
- For the passive verb version, we can drop "is to", although it sounds very archaic to me. If we drop "is to", it feels natural to drop "that" as well. I could imagine someone from the movie "Pirates of the Caribbean" saying this:
The account manager requests the account be locked
- For the passive voice version, we could drop "is"
The account manager requests the account to be locked
This also feels extremely archaic. And in this case, it would feel very unnatural to include the word "that". I think I can explain why:
When I parse sentences of this type, I'm looking for the pattern
The account manager requests [subject] [verb phrase]
The account manager requests [that [complete statement]]
You can substitute [verb phrase] with "is to be locked", "to be locked", and "be locked". However, when we use the word "that", the stuff after it should be a complete statement. For example
the account is to be locked.
This is a complete sentence and thus feels very compatible with the word "that".
the account be locked.
This is not a complete sentence in standard English, but it is okay in certain dialects, especially archaic sounding ones. Therefore it is moderately compatible with the word "that".
the account to be locked.
This is not a complete sentence in any dialect or stylized form of English that I know of. Therefore it is incompatible with the word "that".