Confirmo o agendamento prévio, a senha e o atendimento presencial.

Confirmo is the 1st person singular present indicative of confirmar. In plain English, it means I confirm.

So the speaker is the person doing the confirming. This is a complete verb form by itself; Portuguese does not need a separate subject pronoun here.

Because Portuguese often drops subject pronouns when the verb ending already makes the subject clear.

The ending -o in confirmo tells you it is I.
So both of these are possible:

• Confirmo...
• Eu confirmo...

Adding eu usually gives emphasis, contrast, or extra clarity.

No. Confirmar is normally used as a direct transitive verb, so it can take a direct object with no preposition.

That is why Confirmo o agendamento... is correct.
You can think of it as to confirm something = confirmar algo.

A different structure is also possible with a clause, for example: Confirmo que recebi o e-mail.

Because each noun normally keeps its own article in Portuguese, especially in a list of specific, definite items.

Here the nouns also have different grammatical genders:

• o agendamento — masculine
• a senha — feminine
• o atendimento — masculine

So repeating the articles sounds natural and clear. If you removed them, the sentence would sound more like a heading, checklist, or telegraphic note.

It means something like advance scheduling, prior booking, or an appointment arranged beforehand.

In Brazilian Portuguese, this kind of wording is common in formal, administrative, medical, or customer-service contexts. To an English speaker, prévio may feel slightly redundant, because an appointment is often already understood as scheduled in advance, but in Portuguese this wording is normal and often used for emphasis or formality.

Yes, it could also come before. Portuguese adjectives often come after the noun, so agendamento prévio is perfectly normal.

But with prévio, both orders are possible:

• agendamento prévio
• prévio agendamento

The version with prévio before the noun often sounds a bit more formal, bureaucratic, or like fixed institutional language.

That depends on the context. In Brazilian Portuguese, senha can mean:

• password
• PIN/code
• queue ticket number or service number

That last meaning is especially important in Brazil. In banks, clinics, public offices, and service counters, senha often refers to the number ticket you take while waiting to be called.

So learners should not assume it always means only password.

Atendimento presencial means in-person service, face-to-face assistance, or on-site service.

The adjective presencial is the normal word for the idea of in person or physical attendance.
By contrast, presente usually means present, there, or gift, so it would not be the natural choice here.

So:

• atendimento presencial = in-person service
• presente = present / gift

Because this is just a normal list of three items:

• o agendamento prévio
• a senha
• o atendimento presencial

In standard Portuguese, you usually do not put a comma before e in a simple list. So the punctuation here is normal.

Yes, but it sounds formal and somewhat administrative. It feels like something from:

• a form
• a confirmation message
• a clinic or office script
• a customer-service context

In casual speech, people might simplify it if the context were obvious. But as written, it sounds natural for formal Brazilian Portuguese.