Troubleshooting 403 Error: How do I get the login that was used?

[Zerg00s]

I've been working on some automated deployment scripts that take advantage of the PnP PowerShell Module. Sometimes, when running deployment scripts, 3rd parties report a 403 error. When then occurs, I assume that they entered a correct login and password, but they likely got accessed denied.

How can I get the login of the user that was attempting to access the site via the Connect-PnPOnline? Things I tried:

(Get-PnPConnection | select -ExpandProperty pscredential).username

Unfortunately, it does not contain the user login when using modern authentication and MFA.

Get-PnPContext

$ctx = Get-PnPContext
$ctx.Load($ctx.Web.CurrentUser)
$ctx.ExecuteQuery()
$ctx.Web.CurrentUser
$ctx.Web.CurrentUser.Email

This code will fail if the user does not have enough permissions. The code will fail with a 403 error

Invoke-PnPSPRestMethod -Url "$TARGET_SITE_URL/_api/web/currentUser"

$Response = Invoke-PnPSPRestMethod -Url "$TARGET_SITE_URL/_api/web/currentUser"
$Response.Email

Same issue as above.

Question
Is there a way to figure out what account is used for Connect-PnPOnline commandlet?