I created a dynatrace 14 day trial account

I have a spring boot application

spring.application.name=dynatrace-example
management.endpoints.web.exposure.include=health, metrics
management.dynatrace.metrics.export.step=30s

management.metrics.export.dynatrace.enabled=false

management.dynatrace.metrics.export.uri=https://<<xyz>>.live.dynatrace/api/v2/metrics/ingest
management.dynatrace.metrics.export.api-token=d0c1.B2QUOM54C2AEOAAGT.BKERCOFXPXRE6XA5BKV<<

management.metrics.export.dynatrace.device-id=my-spring-boot-app

Token created using metrics.ingest permissions. Access tokens >> Generate Access token

url like "<<>>.apps.dynatrace/ui/apps/dynatrace.classic.tokens/ui/access-tokens/create?gtf=-2h&gf=all"

Source code - github

Note: I updated /modified appplication properties as above

I am having trouble verifying. I checked Data Explorer and see "No data" - data explorer help

If I change api token, I do see error in my logs, so I think connectivity is ok.

How to troubleshoot and verify ?