He put on scented antiperspirant during ihram because he was unaware of the ruling

I did 'Umrah, praise be to Allah, and I ask Allah to accept it. But
before I entered ihram I put on antiperspirant, and it was scented,
because I was unaware of the ruling on that. Do I have to do
anything?.
Praise be to Allaah.
It is not permissible for the muhrim (pilgrim in ihram) to use perfume
on his body or clothing, because of the hadeeth of Ibn 'Abbaas (may
Allahbe pleased with him) according to which a man's camel threw him
and broke his neck when we were with the Prophet (blessings and peace
of Allah be upon him) and he was in ihram. The Prophet (blessings and
peace of Allah be upon him) said: "Wash him with water and lotus
leaves, and shroud him in his two garments, but do not putany perfume
on him or cover his head, for Allah will raise him on the Dayof
Resurrection reciting the Talbiyah."
Narrated by al-Bukhaari (1267) and Muslim (1206).
Ibn Qudaamah (may Allah have mercy on him) said: The scholars are
unanimously agreed that the pilgrim in ihramis forbidden to use
perfume. End quote.
Al-Mughni, 3/147
The perfume that is forbidden to the pilgrim in ihram includes scented
antiperspirant.
But if a person did that out of forgetfulness or ignorance, he does
not have to do anything, because Allah, may He beexalted, says
(interpretation of the meaning):
"Our Lord, take us not to task if we forget and lapse into error inadvertently"
[al-Baqarah 2:186]
"And there is no sin on you if you make a mistake therein, except in
regard to what your hearts deliberately intend. And Allah is Ever
OftForgiving, Most Merciful"
[al-Ahzaab 33:5].
See also the answer to question no. 49026 .
And Allah knows best.

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