Hello Rosayda,
The new reminder configuration can’t be applied retroactively to approvals that are already pending. Those approvals keep whatever reminder and escalation settings were active when they were created. SailPoint designed it this way to keep approval behavior consistent throughout a request’s lifecycle.
For existing pending requests, you can still send reminders manually from the Admin UI:
Admin > Dashboard > Approval Management > Access Requests > Remind User
If the request has multiple approvers, open the request details and use the Assignees tab to remind the specific person. (docs reference)
Beyond that, the options are to either let the existing requests hit the timeout (default 90 days) and have requesters resubmit, or cancel and resubmit them so the new config picks up. Any newly submitted requests will automatically follow the updated reminder configuration.