Unable to update boundingBox for Note Annotations

    _checkAnnotationBoundingBox (annotation) {
        console.log("Checking Annotation Bounding Box");
        console.log(annotation);
        //copy annotation
        let annotationCopy = JSON.parse(JSON.stringify(annotation));
        if (annotation.motivation === "commenting") {
            const target = annotation.target;
            const selector = target.selector;
            if (selector.subtype === "note") {
                const boundingBox = selector.boundingBox;
                const x1 = boundingBox[0];
                const y1 = boundingBox[1];
                const x2 = boundingBox[2];
                const y2 = boundingBox[3];
                const width = x2 - x1;
                const height = y2 - y1;
                let annotationChanged  = false;
                if (width !== DEFAULT_COMMENT_SIZE) {
                    annotationChanged = true;
                    annotationCopy.target.selector.boundingBox[2] = x1 + DEFAULT_COMMENT_SIZE;
                }
                if (height !== DEFAULT_COMMENT_SIZE) {
                    annotationCopy.target.selector.boundingBox[3] = y1 + DEFAULT_COMMENT_SIZE;
                    annotationChanged = true;
                }
                if (annotationChanged) {
                    console.log("Updating Annotation Bounding Box");
                    console.log(annotationCopy);
                    this.adobeViewer.getAnnotationManager().then(annotationManager => {
                        annotationManager.updateAnnotation(annotationCopy).catch((error) => {
                            console.error("Failed to Update Annotation");
                            console.error(error);
                        });
                    });
                }
            }
        }
        return annotation;
    }

The client I am working for wanted all the Note bubbles to be uniforms sizes when downloaded and read in another pdf viewer. (Sometimes Note Annotations have rectangular instead of square bounding boxes for some reason) So I tried to run this code so that one annotation_added event it would check the size and update, but it throws an error saying there are no updatable fields. I can grab the exact error message later today if needed. 

Side note: I have some syncing logic for updates on different clients and when a note is moved on one client it doesnot move on the other clients which I believe is related.