Selecting traits after Sim's birthday

Product: The Sims Mobile
Platform:Apple iPhone
List the specific devices you play with (e.g. iPhone 6s Plus, Samsung Galaxy S7) iPhone 6 Plus
OS Version 12.4.5
Player ID: (Find your Player ID in Sims Mobile: https://help.ea.com/help/the-sims/the-sims-mobile/find-your-player-id-in-the-sims-mobile ) 1005584159056
How often does the bug occur? Every time (100%)
Steps: How can we find the bug ourselves? View Bird's traits. On Bird's birthday, I was given the option to choose a new trait but decided to choose later. "Ready to add a new Trait", but the "choose trait" button is greyed out.
What do you expect to see? I expect to be able to select a new trait
Connection Type Wifi
Please select your region North America
Country Canada
Additional feedback

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Trying to add a new trait after deferring the option at my Sim's birthday.