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Question

Instantly API Connection Not Working

  • November 5, 2025
  • 3 replies
  • 18 views
S

For some reason my Instantly api key isn’t connecting when trying to reconfigure my account in zapier. Getting this error:

 

We hit an error adding your new account

authentication failed: The app returned "ERR_AUTH_FAILED".

  1. Make sure you click "Allow" or "Accept" on the permission popup
  2. Double check your Account has the correct permissions
  3. Check out our help docs for more information

 

This only happened when I was editing my zap which I created almost a year ago. Otherwise it has been working fine this entire time.

3 replies

Troy Tessalone
Zapier Orchestrator & Solution Partner
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  • Troy TessaloneZapier Orchestrator & Solution Partner
  • Zapier Orchestrator & Solution Partner
  • November 5, 2025

Hi ​@simer_attention 

Instantly help link for using Instantly in Zaps: https://help.instantly.ai/en/articles/7866145-zapier-integration

 

TIP: Try using a new/different private browser to connect Instantly to Zapier

 

⚡ Troy Tessalone - AutomationAce.com | Platinum Authorized Zapier Solution Partner | #1 Zapier Community Contributor
SamB
Community Manager
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  • SamBCommunity Manager
  • Community Manager
  • November 11, 2025

Hi there ​@simer_attention 👋

Did the guides that Troy shared help you get that ERR_AUTH_FAILED error fixed? 

Let us know how it’s going, happy to lend a hand if you’re still stuck at all 🙂

Sparsh from Automation Jinn
Forum|alt.badge.img+6

Hey ​@simer_attention,

Try deleting and reconnecting the Instantly app connection to see if it fixes your issue. See more about it here- https://zapier.com/app/assets/connections.

Otherwise, you can also try contacting the Zapier support here- https://zapier.com/app/get-help.

Hope it helps!

https://zapier.com/partnerdirectory/automation-jinn | Zapier Silver Solution Partner| Automationjinn.com
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