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The reply-to property that is set when submitting an email message to Microsoft Graph is not not recognized once the email is submitted to Microsoft Graph. When the e-mail reaches the destination mailbox, the reply-to field is missing from the email headers.
An API that connects multiple Microsoft services, enabling data access and automation across platforms
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Same issue here and seems to be larger issue since last Wednesday: https://techcommunity.microsoft.com/t5/exchange/reply-to-header-being-stripped-in-office-365-emails/m-p/4213699
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Can you please provide us the code related to the request you're sending along with the response? It is possible the field isn't being set properly. Reproducible steps will help narrow down whether the issue is in your code on in the Graph API.
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You can find more information about it by the link below
For us, the ReplyTo field also stopped working. It just ignored.
If this was already posted a week ago then it doesn't seem worthwhile to repost the question. Refer to the other post where others have already identified what was wrong.