toiawasemadoguti de honninkakunin wo suru.

A common reading is:

といあわせまどぐちで ほんにんかくにんをする

Breakdown:

• 問い合わせ = といあわせ
• 窓口 = まどぐち
• 本人確認 = ほんにんかくにん
• する = する

So the whole sentence is read:

といあわせまどぐちで ほんにんかくにんをする

問い合わせ窓口 is a compound noun.

• 問い合わせ = inquiry / question / contact
• 窓口 = service desk / counter / contact point

Together, 問い合わせ窓口 means something like:

• inquiry counter
• information desk
• customer service desk
• contact desk

It can refer to a physical counter in a building or, in some contexts, a department or point of contact.

Here, で marks the place where an action happens.

So in 問い合わせ窓口で本人確認をする, で shows that the identity check happens at the inquiry desk/counter.

This is a very common use of で:

• 学校で勉強する = study at school
• 店で買う = buy at a store
• 窓口で手続きをする = do the procedure at the counter

If you used に instead, it would sound more like movement toward a place or existence at a place, not the location where the action is carried out.

本人確認 literally breaks down as:

• 本人 = the person themself / the actual person / the person concerned
• 確認 = confirmation / verification

So 本人確認 means identity verification or confirming someone’s identity.

In real-life situations, this often means checking:

• a passport
• a driver’s license
• a residence card
• a name and date of birth
• other identifying information

It is a very common term in banks, phone contracts, government procedures, and customer support.

Japanese often uses a noun + をする pattern where English might use a single verb.

Here:

• 本人確認 is a verbal noun
• する turns it into an action: to do identity verification

This pattern is extremely common:

• 勉強をする = to study
• 確認をする = to confirm/check
• 予約をする = to make a reservation
• 相談をする = to consult/discuss

So 本人確認をする is perfectly normal Japanese.

You may also sometimes see a shorter form like 本人確認する, especially in casual speech or some written contexts, but 本人確認をする is very standard.

The sentence itself does not explicitly say.

Japanese often leaves out the subject when it is understood from context.

Depending on the situation, this could mean:

• the staff verifies the customer’s identity
• you go through identity verification at the desk
• one performs identity verification at the inquiry counter

So the exact doer is ambiguous unless the surrounding context makes it clear.

This is normal in Japanese. A sentence can be complete enough for practical use even without stating who is doing the action.

Not usually.

Even though 本人 literally means the person themself, 本人確認 as a set phrase means verifying that someone is really the person they claim to be.

So it does not usually mean I confirm my own identity in a reflective sense.

Instead, it means something like:

• confirming a customer is really that customer
• verifying that the applicant is the actual person
• checking that the person present matches the ID

So think of 本人確認 as a fixed term: identity verification.

Because Japanese often omits information that is obvious from context.

In English, you usually need a subject:

• The staff verifies your identity at the inquiry counter.
• You complete identity verification at the inquiry counter.

In Japanese, if the situation already makes that clear, the subject can be left out:

• 問い合わせ窓口で本人確認をする。

This kind of wording is especially common in:

• instructions
• manuals
• signs
• procedure descriptions
• notes about steps in a process

So the sentence may feel a little incomplete from an English perspective, but it is very natural in Japanese.

No. In normal Japanese writing, you would usually write it without spaces:

問い合わせ窓口で本人確認をする。

Spaces are often added in teaching materials to make the structure easier to see.

For learners, the spaced version helps identify:

• 問い合わせ窓口 = place noun
• で = particle
• 本人確認 = verbal noun
• をする = action pattern

But in real Japanese text, you generally should not expect these spaces.

Yes, but it sounds a little like a procedure step, memo, or instructional phrase rather than a full conversational sentence.

For example, it could fit in:

• a manual
• a workflow list
• an explanation of a procedure

In everyday conversation, people might say something more specific, such as:

• 問い合わせ窓口で本人確認をします。
• 問い合わせ窓口で本人確認をしてください。
• 問い合わせ窓口で本人確認があります。

So the base sentence is natural, but its tone is somewhat plain and context-dependent.

They differ in style and function:

• 本人確認をする

  • plain dictionary form
  • neutral, basic form
  • often used in descriptions, notes, headings, or casual speech

• 本人確認をします

  • polite form
  • used when speaking politely or writing to customers/users

• 本人確認をしてください

  • request form
  • means please do identity verification or please complete the identity check

So if this is an instruction to a customer, してください might be more likely. If it is just describing a process step, する is very natural.

Yes.

While 窓口 originally suggests a physical service window or counter, it is also often used more broadly to mean:

• the office in charge
• the contact point
• the department handling something

So 問い合わせ窓口 can mean:

• an actual help desk in a building
• a customer support office
• a designated contact department

You have to use context to tell whether it is a literal counter or a more abstract point of contact.