AWS - BIGIP HA is not setting IP on interfaces when on failover

Hi, I'm trying to deploy an high availability system on EC2, but when I've tested the failover actions, the BIG-IP pair are facing issue when trying to change the float IP adressess on AWS interfaces:

IAM Policy:

{
     "Version": "2012-10-17",
     "Statement": [
         {
             "Effect": "Allow",
             "Action": [
             "ec2:describeinstancestatus",
             "ec2:describenetworkinterfaces",
             "ec2:assignprivateipaddresses"
             ],
             "Resource": "*"
         }
     ]
 }

Jul 28 11:02:21 ip-10-0-0-45 err logger: /usr/libexec/aws/aws-failover-tgactive.sh (traffic-group-1): Failed to reassign some or all address(es): 10.0.1.100 10.0.1.100 on interface eni-8de3add1

Deployment guide I've followed:

https://support.f5.com/kb/en-us/products/big-ip_ltm/manuals/product/bigip-ve-high-availability-amazon-ec2-12-1-0.html

Any idea?

Thank you in advance.