The “failed to send message” error on Instagram usually occurs due to unstable internet connections, temporary server issues, or app-related bugs. It can also happen if the recipient has blocked you, restricted messages, or if your account has been limited for suspicious activity or spam detection. In some cases, outdated app versions or corrupted cache data may interrupt message delivery. Resolving the issue typically involves checking your network, restarting the app, updating it, or verifying account status and permissions.

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