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Hi AngelCamero,
When an email is sent from SharePoint either including a sign in code or an alert notification etc., it is sent from the default address i.e., no-reply(at)sharepointonline(dot)com and it includes the site name at the beginning of the address (examples SiteName<no-reply(at)sharepointonline(dot)com>). There is no option/setting to change "From" address. The email is sent directly from the server, we can’t change the email address.
As an alternative, you can consider using Power Automate flow which will allow you to choose the desired address. I found a thread similar to your requirement, please check the link below for reference.
Send Emails From SharePoint Online Application From Specific Email Address
***Third-party link disclaimer:***Microsoft provides no assurances and/or warranties, implied or otherwise, and is not responsible for the information you receive from the third-party linked sites or any support related to technology.
If you need any help creating workflow in Power Automate, we’ll suggest you post in Microsoft Power Automate Community for expert assistance. This is a specific channel related to issues with Power Automate.
The reason I ask you to post a new thread is that in Answers forum, we have limited resources and very little knowledge about Power Automate and in Microsoft Power Automate Community, you will get the most qualified pool of respondents, and other partners who read the forums regularly can either share their knowledge or learn from your interaction.
We appreciate your understanding and co-operation.
With sincerest regards,
Neha