Bucket with name myBucket does not exist

Hi,
Forgot to mention that we upgraded to couchbase server 6.6 (not sure if it’s effecting…)
Our servers deployed in a private virtual machine.
We are using couchbase dependency injection this way:

services.AddCouchbase(Configuration.GetSection(“Couchbase”)); //configuration as i mentioned
services.AddCouchbaseBucket(“RbnsBucket”); //this use the new way of inject bucket name (using INamedBucketProvider interface) , new in couchbase dependency injection client

Hope it’s help