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Unable to authenticate with the external account provider" error in Power Pages Microsoft login

Hi everyone,

I'm trying to configure Microsoft authentication (using Microsoft Entra ID) in Power Pages by following this guide: [https://learn.microsoft.com/en-us/power-pages/security/authentication/oauth2-microsoft]

Here’s what I’ve done so far:

Enabled authentication in my Power Pages site via Power Pages Studio (Security > Identity Providers > Authentication settings).
Registered the site as an app in Microsoft Entra ID (Azure portal):
- Added the correct redirect URI: https://[yoursite].powerappsportals.com/signin-microsoft
- Created a client secret and saved both the Client ID and secret.
Went back to Power Pages > Identity Providers > Configured Microsoft with the Client ID and Secret.
Clicked "Sync" and then tried signing in from the portal.

Issue:
When I click the Sign in button on the portal and select Microsoft, I get the following error message:

"Unable to authenticate with the external account provider."

I'm not sure what’s going wrong. I’ve double-checked the redirect URI and client credentials. My site is still in preview (not live) could that be a factor?

Has anyone else faced this issue, or can guide me on how to troubleshoot it?

Thanks in advance for any help!

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