Hi Welcome to the PBC!
I read your post and YES other people have had similar issues with the Creator Hub Button.
I would suggest clearing your caches on your devices and restarting the app.
Ensure you are running the latest version of the Pinterest App on your devices.
If the above doesn't work and the button is still missing then I would definitely contact Pinterest Support and file a ticket with them as they would be able to offer support on this issue.
I hope this helps you.
To get to the creator hub:
To learn more about the Creator Hub please check out our Help Center article. Hope this helps!