Claude FAQ: Registration/login stuck, verification not received, and risk-control handling

When using Claude for the first time, the easiest points to get stuck are registration/login, not receiving verification messages, or suddenly seeing a risk-control prompt that prevents you from continuing. Below, these high-frequency issues are broken down by scenario and explained clearly; following the steps usually restores normal use quickly. The content only covers Claude’s own usage and account-related issues.

Registration or login keeps spinning, pages won’t load

If Claude keeps spinning or shows a blank page, first check your browser environment: turn off ad blockers and script-related extensions, and reopen in an incognito window. Then clear the site cache and cookies—many “repeatedly jumping back to the login page” issues can be resolved at this step.

If it still doesn’t work, switch to a different browser engine (for example, from certain customized browsers to Chrome/Edge), and make sure your system time and time zone are set to sync automatically. Claude is fairly sensitive to network stability; frequently switching networks or proxy nodes can also cause abnormalities in the login flow.

Verification email not received, verification code always expires

Claude’s registration verification emails are often categorized into the spam folder or the “Promotions/Notifications” tabs—start by searching globally for the sender and relevant keywords. Corporate email systems sometimes block external verification emails; it’s recommended to temporarily switch to a common personal email and try again.

If the verification code is shown as expired, it’s usually because clicking “resend” multiple times invalidates earlier codes. Keep only the last email/last code and use that. Don’t refresh the page before submitting the code; refreshing triggers a new session, and Claude may require you to verify again.

Risk-control prompt, unable to continue verification, or account restricted

If Claude shows a risk-control prompt, first stop repeated login attempts, and don’t keep switching devices and networks in succession. Let the account state “cool down” for a while before trying again. Risk control is usually related to abnormal login behavior, such as multiple failures in a short time, sudden cross-region changes, or overly large changes in environment fingerprinting.

If Claude continues restricting you, the most reliable approach is to submit a ticket through the official support channel, describing your registration email, screenshots of the issue, when it happened, and the approximate steps you took. Avoid repeatedly creating multiple Claude accounts to “try your luck”—this behavior is more likely to compound risk-control restrictions.

Able to log in but chats fail, the Send button is gray, or an error appears

If sending a message in Claude fails, first refresh the page and check for unfinished uploads or network jitter; also confirm your input doesn’t include an overly long paste that causes the frontend to stall. If the Send button is gray, a common cause is that page scripts are being blocked by extensions—temporarily disable the relevant extensions and try again.

If attachment uploads get stuck, try a smaller file or a more common format, and make sure your browser isn’t blocking the site’s permission to read files. If the same issue reproduces across multiple devices, record the error message and reproduction steps and submit them to Claude support—it will save more time than repeatedly retrying.