With Dynamics 365 already connected, the detail's **Status** tab includes a **Test connection** button that checks, on the spot, that the saved credential is still valid against Dynamics's real API (a `WhoAmI` call). **Requirements:** Admin role. 1. Open Microsoft Dynamics 365's **Detail** and go to the **Status** tab. 2. Click **Test connection**. **Result:** "Connection successful" if the credential is still valid, or "Couldn't connect: [reason]" if the secret was revoked or changed (section 8). Remember this confirms the credential is valid — **not** that the security role assigned to the application user has enough permissions: that's only detected when a real action (creating a contact, changing a stage) fails with an insufficient-privileges error. The example below uses Google Sheets again — with Dynamics 365 connected, the same "Status" tab shows the "Test connection" and "Disconnect" buttons.