TeamSiteCollectionCreationInformation creation failed with GetACSAppOnlyContext

(I saw similar issues created but they were closed without any mitigation)

I'm facing an issue when trying to create TeamSite with PnP using the code below:

using (ClientContext cc = new AuthenticationManager().GetACSAppOnlyContext(siteUrl, clientID, clientSecret))
{
    var result = await cc.CreateSiteAsync(new TeamSiteCollectionCreationInformation
    {
        Alias = "mymodernteamsite", // Mandatory
        DisplayName = "displayName", // Mandatory
        Description = "description", // Optional
        IsPublic = true, // Optional, default true
    });
}

Exception:
System.Exception: App-Only is currently not supported, unless you provide a Microsoft Graph Access Token. at PnP.Framework.Sites.SiteCollection.CreateAsync(ClientContext clientContext, TeamSiteCollectionCreationInformation siteCollectionCreationInformation, Int32 delayAfterCreation, Int32 maxRetryCount, Int32 retryDelay, Boolean noWait, String graphAccessToken, AzureEnvironment azureEnvironment) at Microsoft.SharePoint.Client.ClientContextExtensions.CreateSiteAsync(ClientContext clientContext, TeamSiteCollectionCreationInformation siteCollectionCreationInformation) at VnextApi.SharePointUtils.CreateSite(String siteName) in C:\Users\ayelasr\source\repos\VnextApi\VnextApi\SharePointUtils.cs:line 86 at VnextApi.Controllers.ProvisioningController.CreateSite() in C:\Users\ayelasr\source\repos\VnextApi\VnextApi\Controllers\ProvisioningController.cs:line 49 at lambda_method(Closure , Object )

Version:
"PnP.Framework" Version="1.9.0"
netcoreapp3.1

Start at PnP.Framework.Sites.SiteCollection.CreateAsync, where the exception is raised, and trace the call from ClientContextExtensions.CreateSiteAsync to SharePointUtils.cs line 86. Compare the GetACSAppOnlyContext authentication with the site-creation requirements; done means the supported path or a concrete mitigation is established for this failing scenario.