Hi there,
Thanks for reaching out.
We're sorry to hear that you're unable to use text chat despite previously completing the age verification process.
If you haven't done so already, we recommend reviewing your in-game chat settings to ensure text chat is enabled. We also suggest reviewing the [url=https://help.bungie.net/hc/en-us/articles/360048719292-Destiny-2-Text-Chat]Destiny 2 Text Chat Guide[/url].
If the issue persists, please let us know which platform you're playing on and whether you're unable to type in all chat channels or only specific ones. If possible please also share a screenshot showing the issue, you can upload it to a service like Imgur, as this may help us take a closer look.