[CF1] WARP: add troubleshooting steps for device revocation error

Author: deadlypants1973

src/content/docs/cloudflare-one/team-and-resources/devices/warp/troubleshooting/client-errors.mdx

@@ -273,6 +273,17 @@ The device is not authenticated to a Zero Trust organization because:
 3. Select **Re-Authenticate Session**.
 4. Complete the authentication steps required by your organization.
 5. If this does not resolve the error, select **Logout from Cloudflare Zero Trust** and then log back in. Logging out is only possible if [Allow device to leave organization](/cloudflare-one/team-and-resources/devices/warp/configure-warp/warp-settings/#allow-device-to-leave-organization) is enabled for your device.
+6. If the issue persists, contact your administrator for assistance.
+
+### CF\_REGISTRATION\_MISSING(Revoked)
+
+#### Cause
+
+The device is not enrolled in the Zero Trust organization of your company or team. Your device was unenrolled by an administrator on your account.
+
+#### Resolution
+
+Contact your company or team administrator for assistance.
 
 ## CF\_TLS\_INTERCEPTION\_BLOCKING\_DOH