Hi @Toddtran1706 ,
Lets verify the account name once using the following steps.
Select the Windows icon, type Control Panel in the search box and select it.
In Control Panel, search Mail, and select it.
The Mail Setup dialog box opens.
Click Email Accounts
Ensure that the email account name (highlighted in the red box in the image) matches in the properties section for sending emails in Power Automate Desktop like below.

If it appears correct, the last step you can take is to recreate your flow by disabling Power Fx on the flow creation page as shown below. Afterward, attempt to send a sample email to verify if it works properly or not.

If the previous steps do not resolve the issue, change the email message sending configuration from "Account" to "Other Mailboxes." Then, configure the "From" email ID as shown below and try the process again.

Thanks,
Deenu