[Bug]: CWR: Failed to retrieve credentials from STS: TypeError: Cannot read properties of undefined (reading 'split')

Which web client version did you detect this bug with?

v1.6.1

What environment (build systems, module system, and framework) did you detect this bug with?

browserName: Chrome browserVersion: 119.0.0.0 osName: Mac OS osVersion: 10.15.7 deviceType: desktop

TypeScript v5.3.2, ECMAScript modules (ESM)

Is your web application a single page application (SPA) or multi page application (MPA)?

MPA

Please provide your web client configuration

{ sessionSampleRate: 1, endpoint: "https://dataplane.rum.us-east-1.amazonaws.com", telemetries: [ "http", [ "errors", { ignore: (event: ErrorEvent | PromiseRejectionEvent) => "message" in event && // ResizeObserver loop completed with undelivered notifications // ResizeObserver loop limit exceeded event.message.startsWith("ResizeObserver loop"), }, ], "performance", ], allowCookies: true, cookieAttributes: { sameSite: "None", }, enableXRay: false, identityPoolId: rumConfig.identityPoolId, guestRoleArn: rumConfig.guestRoleArn, sessionAttributes: {build: __APP_VERSION__, ...scope}, }

Please describe the bug/issue

I'm seeing this error in production with a few clients and it is sporadic. RUM seems to be working fine as I'm getting the error reports and stats but is occuring daily in the logs. Stacktrace:

/aws-rum-web/dist/es/dispatch/StsClient.js:98:30
/aws-rum-web/dist/es/dispatch/StsClient.js:43:22
/aws-rum-web/dist/es/dispatch/StsClient.js:24:52
/aws-rum-web/dist/es/dispatch/StsClient.js:15:57

I had a look at #345, but it seems unrelated.

aws-observability / aws-rum-web