Error message: "Failed to update customer settings"

Issue symptoms

I am receiving the error Failed to update customer settings after adding a new email in the allowlist or blocklist.

Resolution steps

Receiving this error means that you have exceeded the maximum number of allowed characters in the list. You can only enter a maximum of 10,000 characters in the allowlist or blocklist fields.

For more information, see this article: Setting up your blocklist and allowlist.