Suddenly unable to connect to the Power BI Service using Connect-PowerBIServiceAccount

I've developed a script which performs basic operations with the Power BI service using PowerShell.
All worked fine until 4 days ago and now suddenly I'm not able to login anymore.
By default login is with a Service Principal, however I also tried with a normal AAD account but no luck (login with UI to app.powerbi.com works with the AAD account). I haven't changed anything in the script or on the tenant (it is an O365 demo tenant).

Command:

$ServicePrincipalId = "xxxxx"
$ServicePrincipalSecret = "xxxxx"
$tenant = "xxxx"

$secureServicePrincipalPassword= ConvertTo-SecureString $ServicePrincipalSecret -AsPlainText -Force;
 
$servicePrincipal = New-Object -TypeName PSCredential -ArgumentList $ServicePrincipalId, $secureServicePrincipalPassword

Connect-PowerBIServiceAccount -ServicePrincipal -Credential $servicePrincipal -Environment Public -Tenant $tenant`

Error:

Connect-PowerBIServiceAccount : One or more errors occurred.
At line:1 char:1
+ Connect-PowerBIServiceAccount -Credential (Get-Credential)
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], AggregateException
    + FullyQualifiedErrorId : System.AggregateException

Module Version:
1.0.867 (current version) MicrosoftPowerBIMgmt.Profile

Maybe @jayanth2830 can help as last committer?

Start by reproducing the reported command with MicrosoftPowerBIMgmt.Profile version 1.0.867, using both the service-principal and AAD-account paths through Connect-PowerBIServiceAccount. Compare the resulting AggregateException with the module's authentication behavior; done means identifying the cause and documenting or resolving the login failure.