panic: request error: Forbidden ("{\n\t\"error\": {\n\t\t\"message\": \"Unable to modify existing channel namespace id with POST. (See https://help.ably.io/error/40300 for help.)\",\n\t\t\"code\": 40300,\n\t\t\"statusCode\": 403,\n\t\t\"nonfatal\": false,\n\t\t\"href\": \"https://help.ably.io/error/40300\",\n\t\t\"serverId\": \"frontend.2734.4.us-east-1-A.i-09591a65afe230b47.e7drwLiIABBJRH\"\n\t}\n}") /opt/hostedtoolcache/go/1.18.1/x64/src/testing/testing.go:1389 +0x366 /opt/hostedtoolcache/go/1.18.1/x64/src/testing/testing.go:1392 +0x5d2 /opt/hostedtoolcache/go/1.18.1/x64/src/runtime/panic.go:844 +0x258 /home/runner/work/ably-go/ably-go/ablytest/sandbox.go:125 +0x72 /home/runner/work/ably-go/ably-go/ablytest/sandbox.go:105 +0x52 /home/runner/work/ably-go/ably-go/ably/realtime_channel_integration_test.go:102 +0x228 /opt/hostedtoolcache/go/1.18.1/x64/src/testing/testing.go:1439 +0x214 /opt/hostedtoolcache/go/1.18.1/x64/src/testing/testing.go:1486 +0x725