What are the reasons why Slack API is getting failed_to_send_invite error? - slack-api

Currently using this code to send workspace invites via Slack API, this is working but for some emails it is getting this failed_to_send_invite error. At first I thought it was because of using test emails, but now we also encountered it with a gmail email. Any idea why this error occurs? Documentation only says "The invite failed to send." as the description for this error.
response = slack.admin_users_invite(team_id=workspace_id, email=invitee_email, channel_ids=channel_id, custom_message=custom_msg, guest_expiration_ts=guest_expiry_epoch,is_restricted="true")

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Error creating new twitter application

I try to create new twitter application on https://apps.twitter.com/app/new link and
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Error
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http://s16.radikal.ru/i190/1408/75/a1c2cbdd451e.png
I use gmail account, but I still did not receive any confirmatiom email. How knows what is wrong ?
About 24 hours has gone...
Anybody knows if service works ?

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