I've paid to upgrade my self-hosted retool account to business but Retool still says "Granular access controls are not available in your plan.
Upgrade to create custom groups."
I've tried logging in/out, invalidating all sessions and logging back in. All with no luck.
It may take a few hours for changes to self hosted plans to reflect on your instance. If you made the change recently, you can try manually updating your license key in settings > advanced > check key, which can force an update immediately.
The key itself does not change. However, available features are encoded in the key, and your instance periodically fetches changes to the license status and available features.
Are you saying that it would be only possible to do this with an Enterprise subscription?
The billing page implies that it should be possible on the business plan:
Make sure that you have updated the "all users" group app access level to "Define specific app access" as well, so that edit permissions aren't automatically inherited.