demandé demandée

Bonjour Raymond,

Here ‘lui’ refers to an indirect object pronoun and therefore the past participle doesn’t agree with the object even if placed ahead in the verbal expression.

Indeed, the verb used in the example is ‘demander [qch] à [qqun]’ = to ask [sth] to [sb] where the object is introduced by a preposition (à).

Here is a link to remind you of the rule:

special-cases-when-the-past-participle-agrees-in-number-and-gender-when-used-with-avoir-in-le-passe-compose-conversational-past

 

I hope this is helpful.

Bonne journée!