PS5 - How to request restricted game?

The workaround posted on this Reddit thread worked:

1. In the child account, go to settings and use the Parental Setting key to temporarily disable Parental Controls
2. Still in the child account open the game and actually get as far as starting a new game.
3. Close the game using the switcher (I did this by switching to Astro's Playroom)
4. Still in the child account re-enable parental controls
5. Start the game again. The child will be able to request access.
6. Switch to the parent account and grant access.
7. Switch to the child account and try the game. If you have linked to an Ubisoft account you may now have to request access to communications functions.
8. Switch to the parent account and grant access to communications functions.

Although it’s not ideal that you have to resort to a clunky workaround.