Also facing the same issue. Did updated App Bridge to 3.x + CSP header correct + used apiKey & host parameter at initialization + APpBridge script for WebVitals. So did all the steps required on that referred page but still the same issue.
Also facing the same issue. Did updated App Bridge to 3.x + CSP header correct + used apiKey & host parameter at initialization + APpBridge script for WebVitals. So did all the steps required on that referred page but still the same issue.