MS Graph Notifications - Error: Operation: Read; Exception: [A task was canceled.]

Question

Title says it all.

We have been using msGraph notification service just fine for the 10-12 months.

Recently, our integrations are throwing endless errors that give no more information than the above error.

There are no references to this error in any documentation or answers to anyone else who has experienced the issue over the years.

    "trace": "Error: Operation: Read; Exception: [A task was canceled.]\n    at new GraphError (/code/node_modules/@microsoft/microsoft-graph-client/lib/src/GraphError.js:32:28)\n    at Function.GraphErrorHandler.constructErrorFromResponse (/code/node_modules/@microsoft/microsoft-graph-client/lib/src/GraphErrorHandler.js:62:22)\n    at Function.<anonymous> (/code/node_modules/@microsoft/microsoft-graph-client/lib/src/GraphErrorHandler.js:89:48)\n    at step (/code/node_modules/@microsoft/microsoft-graph-client/node_modules/tslib/tslib.js:143:27)\n    at Object.next (/code/node_modules/@microsoft/microsoft-graph-client/node_modules/tslib/tslib.js:124:57)\n    at /code/node_modules/@microsoft/microsoft-graph-client/node_modules/tslib/tslib.js:117:75\n    at new Promise (<anonymous>)\n    at Object.__awaiter (/code/node_modules/@microsoft/microsoft-graph-client/node_modules/tslib/tslib.js:113:16)\n    at Function.GraphErrorHandler.getError (/code/node_modules/@microsoft/microsoft-graph-client/lib/src/GraphErrorHandler.js:85:24)\n    at GraphRequest.<anonymous> (/code/node_modules/@microsoft/microsoft-graph-client/lib/src/GraphRequest.js:312:84)",
    "message": "Operation: Read; Exception: [A task was canceled.]"