hey @noelleon
does not work for me either, but i also have a copilot 365 license, maybe we need another one, idk.
did you check in the preview tab in the settings if you turned on the new Powerfx formula bar?
i did find this online:
Note: Comment generated Power Fx is being released as a preview feature with English only support, and the rollout will be gradual as capacity becomes available. This means that some users will be able to try out the feature and provide feedback, while the team works on ensuring there is a positive user experience for our global footprint of Power Apps makers.
maybe its not public preview and it does not work for everybody
Let me know if my answer helped solving your issue.
If it did please accept as solution and give it a thumbs up so we can help others in the community.
Greetings