Hi @Yee ,
Are you trying to add a new Atlassian app to your site or a new Marketplace app?
Also, how are you trying to add the app? For Atlassian apps, you can navigate to admin.atlassian.com > Apps > Atlassian apps and click on "Add app"
Regarding Marketplace apps, the easiest way would be to navigate to the Marketplace app listing and start the app trial from there.
If you're still experiencing issues with adding the app, as stated in the message, you can reach out to Atlassian Support. If you're on free plan or if you have any billing-related questions or issues, you can use the following channel to raise a request: Atlassian Support: Pricing, Billing & Licensing
Cheers,
Tobi
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