Here is a screenshot of the full error.
From researching this error I seems to be caused due to the user was not found/exists. I have checked the Microsoft Office 365 Directory for active users and was able to find the user. I am using their email to search for the user and can confirm that the email matches the user's email setup in the Microsoft Office 365 Directory.
I did notice that the user did not have a Microsoft Power Automate Free license but I tried the flow with another user which also did not have the license and it the flow ran. Would like to know what else I can check.
Note: I also checked the Azure AD and the user does exist in the domain.