Groups Assignment with SCIM

I am trying to add a user to multiple groups and assign the same based on rules via SCIM based provisioning, When a user is added to first group we receive the POST request for the user from OKTA, but on assigning the user to another group, we dont receive any requests from OKTA,

We have already made sure of managing the priority of groups.

Our main aim is to support switching of groups for user.

Any help is appreciated.

Thank You