Configure Yaml Config Spring Sleuth With Grafana Tempo

Question

I tried to configure Spring Sleuth and grafana tempo I got an error like this please help I've been stuck for a couple days :

2022-04-18 11:37:11.615 DEBUG 21240 --- [_WorkerThread-1] i.o.s.t.e.BatchSpanProcessor$Worker      : Exporter failed {} 
2022-04-18 11:37:16.940 DEBUG 21240 --- [_WorkerThread-1] i.o.s.t.e.BatchSpanProcessor$Worker      : Exporter failed {} 
2022-04-18 11:37:22.267 DEBUG 21240 --- [_WorkerThread-1] i.o.s.t.e.BatchSpanProcessor$Worker      : Exporter failed {} 
2022-04-18 11:37:27.594  WARN 21240 --- [ault-executor-0] i.o.e.otlp.trace.OtlpGrpcSpanExporter    : Failed to export spans. Error message: UNAUTHENTICATED: HTTP status code 401
invalid content-type: application/json
headers: Metadata(:status=401,content-type=application/json,x-content-type-options=nosniff,content-length=74,date=Mon, 18 Apr 2022 04:37:27 GMT,via=1.1 google,alt-svc=clear)
DATA-----------------------------
{"status":"error","error":"authentication error: no credentials provided"}
DATA-----------------------------
 {} 

here is my config.yaml

 spring:
  application:
    name: my app
  jackson:
    default-property-inclusion: NON_NULL
  profiles:
    active: local
  servlet:
    multipart:
      max-file-size: 10MB
      max-request-size: 12MB
  sleuth:
    enabled: true
    otel:
      config:
        trace-id-ratio-based: 1.0
      exporter:
        otlp:
           endpoint: https://tempo-eu-west-0.grafana.net/tempo
           headers:
                authorization: xxxxx