Hi @kendallmason
Please note that this plugin is end-of-life. Please remove it from your system and instead install its successor from the WordPress plugins directory at https://www.ads-software.com/plugins/wpo365-msgraphmailer/.
Also, please note that you cannot change the “From” name, when sending emails using Microsoft Graph. This name will also be equal to the account’s display name. To work around this, you can – for example – create a Shared Mailbox in Microsoft 365 with a more appropriate name and make the account that you configured to submit email messages to Microsoft Graph (the default “From”) a member of that Shared Mailbox.
Hope this helps!
-Marco
PS Support for sending emails from a Shared Mailbox is a premium feature.