user_AuthenticatedId column empty in appInsights requests and traces

Start with the official Azure Monitor documentation and the ApplicationInsights-Java-Repros example referenced in the report, then reproduce the behavior with Java Agent 3.7.3, Spring 4.3, and the shown OpenTelemetry attributes. Trace how enduser.id and enduser.pseudo.id are handled for requests and traces. Done means the expected user_AuthenticatedId and related fields are populated consistently.

Expected behavior

After following official documentation, I expect user_AuthenticatedId to be populated in requests table of AppInsights.

Actual behavior

user_AuthenticatedId is still empty (as well was customDimension is not populated).

To Reproduce

Submitting a PR with an example reproducing the issue in this repository would make it easier for the Application Insight maintainers to help you. Before doing this, you have to fork this repository.

System information

Please provide the following information:

• SDK Version: Agent Azure Monitor Java 3.7.3
• OS type and version: Linux with Apache Tomcat 9.0
• Application Server type and version : Web App service with WAR deployment
• Using spring-boot? Spring Framework 4.3
• Additional relevant libraries (with version, if applicable): opentelemetry-api version 1.0.0 or 1.63.0 (latest)

Logs

There is no relevant log in /var/log/applicationinsights/applicationinsights.log:

2026-06-24 19:12:03.159Z INFO  c.m.applicationinsights.agent - Java version: 1.8.0_472, vendor: Temurin, home: /usr/lib/jdk/jre   
2026-06-25 05:59:52.235Z WARN  i.o.s.a.ResourceConfiguration - Found reference to io.opentelemetry.sdk.autoconfigure.internal.Envi
2026-06-25 06:00:11.559Z INFO  c.m.applicationinsights.agent - Application Insights Java Agent 3.7.3 started successfully (PID 169
2

Screenshots

This…

log.info("Span valid: {}", span.getSpanContext().isValid());
Span.current().setAttribute("test.attribute", currentUserId);
Span.current().setAttribute("enduser.id", currentUserId);
Span.current().setAttribute("enduser.pseudo.id", currentUserId);

… produces this…

• test.attribute is populated in customDimensions of requests
• customDimensions does not contain enduser.id and enduser.pseudo.id properties
• user_AuthenticatedId is empty
• user_Id is empty