The "Unable to use address" error with the message "context on type d2" in the POP MART app is most likely related to server overload, account flagging, or issues with your saved shipping address during high-traffic releases. While this specific error message ("context on type d2") is not directly documented in the search results, the troubleshooting steps for similar POP MART checkout and address-related errors are well established and can help resolve your issue.

Here are practical steps to fix or work around this error:

- Switch to the Website: Many users report more success by completing their purchase on the POP MART website, not the app, especially during high-demand drops1.

- Check and Re-Enter Your Address:
- Ensure your shipping address is valid, complete, and uses standard formatting without unusual characters or symbols.
- Try deleting and re-adding your address in your account settings.
- If your account is showing address or "invalid shipping" errors, try using a new address or a slightly modified version (for example, using abbreviations or correcting the postal code)6.

- Log Out and Back In: Sign out from the POP MART app (and all other devices), then log back in to clear any session issues348.

- Offload/Reinstall the App: On iPhone, go to Settings > General > Storage > POP MART. Offload the app, then reinstall it to refresh data and force an update245. On Android, you can clear cache/data from Settings > Apps.

- Try a Different Account: If your account or email has been flagged, switch to a different account or email. POP MART sometimes flags users for multiple tasks, order attempts, or rapid actions6.

- Change Your Network: Switch between Wi-Fi and mobile data, as some errors are linked to IP or network filtering4.

- Wait and Retry: During product launches, errors often result from server overload. Waiting a few minutes and then trying again can work137.

- Contact POP MART Support: If the error persists after these steps, reach out to POP MART customer service with specifics about your account and the error message.

> Note: If you are running multiple checkout attempts, using automation/bots, or excessively refreshing, POP MART may temporarily block your account or address6. Always use legitimate accounts and avoid prohibited automation to reduce the risk of flags.

These steps address the most likely causes of your error. If "context on type d2" refers to a specific internal error code and the above does not resolve it, it's possible POP MART's system is overloaded or there’s an undiagnosed bug—waiting or using another account is the best workaround in these cases.