Running into account registration issues, login hiccups, or API errors with Claude is pretty common, and many beginners aren’t sure where to start. This article covers the most frequent Claude problems—including account verification, payment & subscription issues, and API call errors—to help you pinpoint and fix them fast.
1. Account Registration & Login Issues
The biggest headache when signing up for Claude is not getting the SMS verification code. Right now, Claude restricts virtual numbers and numbers from certain countries, so it’s best to use a real carrier number that hasn’t been linked to another account. If you keep seeing “inactive status” after logging in, it’s usually due to an unstable network or a temporarily restricted IP. Try switching to a clean node or wait a few hours before retrying.
Another common scenario is getting your account temporarily locked because of multiple device logins. Claude allows the same account on several devices, but too many requests in a short time can trigger security flags. In this case, stop all operations, log into the official site from the same IP, and the lock should clear.
2. Payment & Subscription Failures
Many users get a “payment failed” message when trying to subscribe to Claude Pro. Common causes include: your card doesn’t support international payments, the billing address doesn’t match what’s on file with your bank, or insufficient funds. Claude only accepts international credit cards like Visa and Mastercard—enable overseas payment permissions first. If you’re using a prepaid or virtual credit card, it’s very likely to be rejected; try a physical card instead.
Some users successfully subscribe but can’t access Pro features. This is often due to a settlement delay. Check your card’s transaction record, then try clicking “Restore Purchases” in the settings page to re-sync, or contact support with your transaction ID for help.
