Unfortunately email can be like that. It works most of the time, but sometimes messages just poof. Especially if email is being sent by some small hosting account (more suspicious) as opposed to large email service (less suspicious).
You can try to verify with hosting if emails were really sent, but if they were I don’t think you will ever know what happened with them along the way.
PS btw maybe it will arrive after all, several times I experienced emails sent earlier stuck somewhere and arrive hours later than newer emails
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