Your policy number is in your valuation statement in the Jarvis app.
To get it: Menu ☰ › Documents › Statements › Request a Statement
After a few seconds a new valuation statement appears. Open it and your policy number is your Account ID, listed inside, in the format JARVS-123456.
If you do not have a policy number yet, your employer may not have finished enrolling you. Contact your employer or HR to check.