Authentication issues in Angular app with Static Web Apps and MSAL

**Describe the bug**

After successful login through SWA, MSAL doesn't detect any authenticated accounts, causing a redirect loop.

**Setup**

Angular application using the latest MSAL version
Deployed on Azure Static Web Apps (SWA) with Entra ID authentication
Route guard checks MSAL for user authentication
If not authenticated, redirects to SWA auth route

**Expected behavior**
User authenticates with SWA and is able to be used by MSAL when Angular application auth runs.

**SWA auth config**

"identityProviders": {
"azureActiveDirectory": {
"registration": {
"openIdIssuer": "https://login.microsoftonline.com/#{PLACEHOLDER_ADTENANTID}#/v2.0",
"clientIdSettingName": "AZURE_CLIENT_ID",
"clientSecretSettingName": "AZURE_CLIENT_SECRET"
}
}
}

**MSAL config**
Same Tenant and Client Id

**Route guard(simplified) causing the loop**
```
if (this.msal.instance.getAccounts().length > 0)
return 'AUTHENTICATED'

return redirectTo(SWAURL + '/.auth/login/aad')
```

**Additional context**
The application should be able to run and authenticate locally using only Angular, without relying on Azure Static Web Apps or its CLI.