Adobe IO Hosted CIF reference Implementation Graphql End Point

Hosted the CIF reference graphql  on Adobe IO and the result will be

web actions:
-> https://xxx-development.adobeio-static.net/api/v1/web/projectname/dispatcher
-> https://xxx-development.adobeio-static.net/api/v1/web/projectname/cif-schema
non-web actions:
-> https://xxxx-development.adobeioruntime.net/api/v1/projectname/cart
To view your deployed application:
-> https://xxx-development.adobeio-static.net/index.html
To view your deployed application in the Experience Cloud shell:
-> https://experience.adobe.com/?devMode=true#/custom-apps/?localDevUrl=https://xxx-development.adobeio-static.net/index.html
skipping publish phase...
Successful deployment 🏄

On configuring the end point in AEM , what's the url need to provide as graphQL end point

I am giving   https://xxx-development.adobeio-static.net/api/v1/web/projectname/dispatcher  as end point , i am getting error like

Caused by: java.lang.RuntimeException: GraphQL query failed with response code 400
at com.adobe.cq.commerce.graphql.client.impl.GraphqlClientImpl.executeImpl(GraphqlClientImpl.java:339) [com.adobe.commerce.cif.graphql-client:1.7.10]
at com.adobe.cq.commerce.graphql.client.impl.GraphqlClientImpl.lambda$execute$6(GraphqlClientImpl.java:275) [com.adobe.commerce.cif.graphql-client:1.7.10]
at com.google.common.cache.LocalCache$LocalManualCache$1.load(LocalCache.java:4724) [com.adobe.granite.osgi.wrapper.guava:15.0.0.0002]
at com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3522) [com.adobe.granite.osgi.wrapper.guava:15.0.0.0002]
at com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2315) [com.adobe.granite.osgi.wrapper.guava:15.0.0.0002]
at com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2278) [com.adobe.granite.osgi.wrapper.guava:15.0.0.0002]
at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2193) [com.adobe.granite.osgi.wrapper.guava:15.0.0.0002]
... 439 common frames omitted

Please guide is the graphQL url configured is correct? if it's how to resolve 400 error.