If you are asking about a problem you are experiencing, please use the following template, as it will help us help you. If you have a different problem, please delete all of this text 
TIP 1: select at least one tag that further categorizes your topic. For example server for APM Server related questions, java for questions regarding the Elastic APM Java agent, or ui for questions about the APM App within Kibana.
TIP 2: Check out the troubleshooting guide first. Not only will it help you to resolve common problems faster but it also explains in more detail which information we need before we can properly help you.
Kibana version: 8.13.0
Elasticsearch version: 8.13.0
APM Server version: 8.13.0
APM Agent language and version: .Net core/Windows IIS web server
Browser version: Chrome
Original install method (e.g. download page, yum, deb, from source, etc.) and version: Docker Compose file
Fresh install or upgraded from other version? Fresh Install
Is there anything special in your setup? For example, are you using the Logstash or Kafka outputs? Are you using a load balancer in front of the APM Servers? Have you changed index pattern, generated custom templates, changed agent configuration etc.
We are not using any Load balancer, Kafka outputs.
Description of the problem including expected versus actual behavior. Please include screenshots (if relevant):
Steps to reproduce:
- We have integrated APM .Net core Agent on IIS web server and added Agent key details but still APM logs are not showing.
- When we validate APM-server test output showing successful message
- When we verify APM server logs errors showing as below.
2024-05-14T04:16:37.604685654Z precondition failed: error querying cluster_uuid: status_code=401 | log.level=error @timestamp=2024-05-14T04:16:37.604Z log.logger=beater log.origin={"function":"github.com/elastic/apm-server/internal/beater.waitReady","file.name":"beater/waitready.go","file.line":64} service.name=apm-server ecs.version=1.6.0
137
2024-05-14T04:16:42.604582061Z precondition failed: error querying cluster_uuid: status_code=401 | log.level=error @timestamp=2024-05-14T04:16:42.604Z log.logger=beater log.origin={"function":"github.com/elastic/apm-server/internal/beater.waitReady","file.name":"beater/waitready.go","file.line":64} service.name=apm-server ecs.version=1.6.0
Errors in browser console (if relevant):
Provide logs and/or server output (if relevant):
2024-05-14T04:16:37.604685654Z precondition failed: error querying cluster_uuid: status_code=401 | log.level=error @timestamp=2024-05-14T04:16:37.604Z log.logger=beater log.origin={"function":"github.com/elastic/apm-server/internal/beater.waitReady","file.name":"beater/waitready.go","file.line":64} service.name=apm-server ecs.version=1.6.0
137
2024-05-14T04:16:42.604582061Z precondition failed: error querying cluster_uuid: status_code=401 | log.level=error @timestamp=2024-05-14T04:16:42.604Z log.logger=beater log.origin={"function":"github.com/elastic/apm-server/internal/beater.waitReady","file.name":"beater/waitready.go","file.line":64} service.name=apm-server ecs.version=1.6.0