AAD authentication not authenticating - Azure Static Web App

We're using custom authentication and roles to limit access to certain users within the tenant. I have 'assignment required' set to yes in the enterprise application, and have added myself as a contributor in the app and also added myself with the 'default role' in the enterprise users and groups.

The issue is that after authenticating, it returns a 401. Any insights as to why authentication is failing?

The staticwebapp.config.json is below (my has been removed for this thread).

{
"routes": [
{
"route": "/*",
"allowedRoles": [
"authenticated"
]
}
],
"auth": {
"identityProviders": {
"azureActiveDirectory": {
"registration": {
"openIdIssuer": "https://login.microsoftonline.com//v2.0",
"clientIdSettingName": "AZURE_CLIENT_ID",
"clientSecretSettingName": "AZURE_CLIENT_SECRET"
}
}
}
},
"responseOverrides": {
"401": {
"redirect": "/.auth/login/aad?post_login_redirect_uri=.referrer",
"statusCode": 302
}
}
}

thanks!