Opensearch manual snapshot issues

Hi, Im trying to create manual snapshots from my Opensearch cluster. I followed the procedure in documentation and some posts without success.

This is what Im doing:

1. Create TheSnapshotRole:

    	{
    	"Version": "2012-10-17",
    	"Statement": [
    		{
    			"Action": [
    				"s3:ListBucket"
    			],
    			"Effect": "Allow",
    			"Resource": [
    				"arn:aws:s3:::yyyyy-opensearch-snapshots"
    			]
    		},
    		{
    			"Action": [
    				"s3:GetObject",
    				"s3:PutObject",
    				"s3:DeleteObject"
    			],
    			"Effect": "Allow",
    			"Resource": [
    				"arn:aws:s3:::yyyyy-opensearch-snapshots/*"
    			]
    		}
    	]
    }
   

2. TheSnapshotRole Trust relationship:

    {
    	"Version": "2012-10-17",
    	"Statement": [
    		{
    			"Effect": "Allow",
    			"Principal": {
    				"Service": "es.amazonaws.com"
    			},
    			"Action": "sts:AssumeRole"
    		}
    	]
    }
   

3. I created an IAM user (snapuser), and attach it this policy:

    {
    	"Version": "2012-10-17",
    	"Statement": [
    		{
    			"Effect": "Allow",
    			"Action": "iam:PassRole",
    			"Resource": "arn:aws:iam::yyyyy:role/TheSnapshotRole"
    		},
    		{
    			"Effect": "Allow",
    			"Action": "es:ESHttpPut",
    			"Resource": "arn:aws:es:us-east-2:yyyyy:domain/opensearch-yyyyy/*"
    		}
    	]
    }
   

4. In Opensearch console Security - Roles, I created a new role with this permissions:

    cluster:admin/snapshot/create
    cluster:admin/snapshot/get
    cluster:admin/snapshot/status
    cluster:admin/snapshot/delete
    cluster:admin/repository/delete
    cluster:admin/repository/get
    cluster:admin/repository/put
    cluster:admin/repository/verify
   

5. Enter Roles - Mapped Users, and add to backend roles, mi created IAM user (snapuser) ARN:

    arn:aws:iam::yyyyy:user/snapuser
   

6. Try to create the repository through python script and authenticating with the created user (snapuser) and AWS credetials and get this error:

    {
       "error":{
    	  "root_cause":[
    		 {
    			"type":"security_exception",
    			"reason":"no permissions for [cluster:admin/repository/put] and User [name=arn:aws:iam::yyyyy:user/snapuser, backend_roles=[], requestedTenant=null]"
    		 }
    	  ],
    	  "type":"security_exception",
    	  "reason":"no permissions for [cluster:admin/repository/put] and User [name=arn:aws:iam::yyyyy:user/snapuser, backend_roles=[], requestedTenant=null]"
       },
       "status":403
    }
   

Any idea how to solve this issue?