Header Insertion doesn't work

[K.Balas]

Hi,

I try to enable HTTP Header Insertion to allow only my company's domain. I see the header insertion in the logs, but I got an error:

This account is not allowed to sign in within this network.

Please talk to  your network administrator for more information."

I got this error when I try to use a Gmail domain, for example, but even if I use my company domain.

I tried to create a decryption profile and enable StripALPN, but it still doesn't work.