Unable to update Action URL / Subject for email templates — EMAIL_TEMPLATE_UPDATE_NOT_ALLOWED
Subject: Unable to update Action URL / Subject for email templates — EMAILTEMPLATEUPDATENOTALLOWED
Project ID: charitey-37ce8
Project name: Fourth Idly
Description:
I'm trying to customize the password reset email template for my Firebase Authentication project. Specifically, I need to update:
The Action URL (currently https://charitey-37ce8.web.app/__/auth/action) to point to my custom domain
The email subject line
Both attempts fail with the same result:
Via Firebase Console: Clicking "Save" on Authentication → Templates → Password reset → Customize action URL shows a generic error: "An error occurred updating action URL."
Via the Identity Toolkit REST API (projects.updateConfig with updateMask=notification.sendEmail.callbackUri), the request returns:
{
"error": {
"code": 400,
"message": "EMAILTEMPLATEUPDATENOTALLOWED",
"status": "INVALID_ARGUMENT"
}
}
Other fields (sender name, from-address, reply-to) update successfully through the same console page — only the Action URL and Subject are refused.
Could you please look into why this project has this restriction, and lift it if possible? This is blocking normal branding customization for a production app.
Thank you
FOURTH IDLY
shared this idea
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"Same issue on project charitey-37ce8 (Fourth Idly). Confirmed via both Console and Admin API (PATCH with updateMask=notification.sendEmail.callbackUri returns the same 400 EMAIL_TEMPLATE_UPDATE_NOT_ALLOWED)."
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Bruno Ivazeta commented
Firebase Authentication prevents updating the Password Reset action URL. The Console fails and the Admin API returns 400 EMAIL_TEMPLATE_UPDATE_NOT_ALLOWED. Additionally, the Firebase bug report form fails during submission.