While support cannot add any Twitch Drop items to player accounts manually, we can help you confirm the Twitch link is working on both ends.
To ensure that your Warframe and Twitch accounts are properly linked, please check your Account Management page here https://www.warframe.com/user and make sure it shows the correct Twitch account username at the bottom, then check the Twitch connections page https://www.twitch.tv/settings/connections and make sure Warframe is listed in the "OTHER CONNECTIONS" section.
If you do not see the correct account there or any error appears on this page, please try the following:
1. Unlink your Twitch and Warframe accounts via https://www.warframe.com/twitch/unlink_action
2. Disconnect Warframe from Twitch via https://www.twitch.tv/settings/connections
3. Reconnect your Twitch and Warframe account following the instructions on https://www.warframe.com/en/freeprime
We apologize for any inconvenience this may have caused and hope you continue to enjoy Warframe!