Claude FAQ: How to Handle Account Restrictions, CAPTCHA Errors, and Message Send Failures

When using Claude, the most common sticking points are login CAPTCHAs, messages failing to send, attachment upload failures, and account restrictions. Below, the issues are broken down by scenario so you can troubleshoot quickly on your own step by step. When you encounter similar errors, start with the basic checks in order—usually you can recover immediately.

What to do if you can’t log in and the CAPTCHA keeps spinning

If the Claude login page repeatedly asks for verification or the CAPTCHA won’t load, first retry in an incognito window and clear the site’s cookies and cache. Browser extensions (ad blockers, script managers, privacy/anti-tracking tools) can easily interfere with the verification flow, so it’s recommended to temporarily disable them all and then log in again.

An unstable network environment or frequently changing IP address can also trigger additional verification. Try to stay on the same network for a while before proceeding. If you’re using a corporate network or public Wi‑Fi, it may be blocked by policy; switching to a mobile hotspot is often a faster way to pass verification.

How to troubleshoot when Claude messages fail to send and keep “Retrying”

If Claude shows send failures or an endless spinner, first refresh the page and confirm the conversation isn’t stuck in the attachment-parsing stage. If necessary, copy your input content locally, start a new chat, and send it again. If only one conversation is abnormal but a new chat can send normally, it’s usually because the context in that conversation is too long or some portion of the content triggered a safety check—remove sensitive segments and try again.

If you see a “too many requests” or rate-limit message, stop submitting repeatedly, wait a while, and then send again. Try to merge questions and reduce multiple clicks in a short period. For long text, submit in sections so Claude is less likely to time out.

What to do if attachment uploads fail or parsing gets stuck

If Claude fails to upload a file, first check whether the file is being used by another application, and try renaming the file to a simple English name. Browser uploads are very sensitive to network jitter, so use a more stable network, or split large files into smaller ones and upload them in batches.

If the upload succeeds but parsing keeps spinning, go back to the conversation list and re-enter the chat, or simply initiate the same upload again. If it fails repeatedly, switching browser engines (for example, changing from one browser to another) often bypasses local compatibility issues.

How to self-recover when your account is restricted, blocked, or shown as unavailable

If Claude indicates your account is restricted or unavailable, first confirm whether you’ve been switching devices/networks frequently in a short time. Switching too often can trigger risk controls, so it’s recommended to stick to a fixed device and network, leave it alone for a while, and then try logging in again. Don’t repeatedly try incorrect passwords or keep refreshing the verification page—this can worsen the block.

If you’re sure it’s a false positive, submit an appeal through the support entry provided on the Claude page. Include your commonly used login email, screenshots of the error, and the approximate time it occurred—this can significantly improve handling efficiency. During the appeal, avoid creating new accounts or repeatedly logging in on the same device, to prevent making the risk assessment more complicated.