Couple of things you want to check -
1. Make sure the attribute is enabled on the channel

1. Make sure the can be refined check is enabled.

2. The attribute is added to the attribute group.
3. The attribute group is added to the Product attribute groups under commerce product hierarchy
4. The attribute group is added to the Product attribute groups under commerce navigation hierarchy
5. Publish channel updates
6. Confirm the attributes are configured on the released products for you channel.
7. lastly, run the 9999 job
On the Site builder -
- Go to Site Settings > Extensions.
- Under Ratings and Reviews, Hide rating checkbox is unchecked.