IPv6 provides an additional addressing path that may coexist with IPv4. A service can behave differently on the two paths if routing or configuration is faulty. Diagnose the affected application before treating IPv6 itself as the problem.
Look for a repeatable difference
Record whether only certain services fail and whether other devices show the same pattern. A capable diagnostic tool can compare IPv4 and IPv6 connectivity, but a single failed probe does not establish a general protocol fault.
Use a limited comparison
If the platform and network administrator permit it, test a documented temporary configuration change on one device. Keep the original settings available. Disabling a protocol on the router affects many services and can conceal the real configuration issue.
Escalate the evidence
Report the affected hostname, access path and comparison result to the relevant provider. Avoid posting full account URLs. A precise dual-stack finding is more actionable than a claim that all IPv6 streaming is unreliable.