Checklist

• Credentials - re-paste the key/token into the secret; it is write-only, so a blank field means "unchanged", not "empty".
• Identifiers - confirm the site/property id matches the service (GA4 property id, Matomo idsite, Plausible domain, Umami website_id).
• Reachability - the Joomla server must reach the service host/port outbound; check firewalls and that the base URL is correct and uses the right scheme.
• Permissions/plan - some services need a specific API scope or plan tier (e.g. Plausible's Stats API).
• Clock - OAuth and signed requests fail if the server clock is badly skewed.

Still failing? Enable Joomla debug/logging and read the mokonyxinsight log channel for the provider's underlying error.