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What does ERR_NGROK_4108 mean?

ngrok returns ERR_NGROK_4108 with this message:

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Why does ngrok return ERR_NGROK_4108?

If you’re receiving this error, ngrok does not permit sign-ups from your email provider. ngrok limits sign-ups from some providers to curb abuse. To sign up for ngrok, use a different email address.

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Where can I get more help with ERR_NGROK_4108?

Email support@ngrok.com and include the error code.