Your application credentials might have expired or lack proper permissions. Generate fresh tokens from the API credentials section and update your scripts immediately. Double-check that you're using the correct endpoint URL for your region—mixing EU and CA endpoints causes authentication failures. For service accounts, verify the attached policy grants necessary rights for your operations.
Clear your browser cache and cookies completely. The dashboard uses heavy JavaScript that conflicts with outdated cached assets. Try accessing through an incognito window first—if that works smoothly, your regular browser profile needs cleanup. Some ad blockers interfere with the interface rendering, so whitelist the management console domains.
Modifications take 5-15 minutes to push to all nameservers. If records still show old values after an hour, check that you clicked the refresh button in the zone editor—changes save as drafts until explicitly applied. Verify your domain actually points to OVH nameservers using a dig command. Third-party DNS won't reflect changes made in their panel.