Like the title said some user have reported a 401 error while trying to accessing a form on our website. The problems seems to occur when the user has already filled the form and has a mkto cookie on his machine.
I was able to recreate the problem on my machine and was able to fix it by clearing my cookies but I cannot ask my customer to do that.
I ask our dev team to look into it and they came back blaming Marketo for the error.
What can cause this and what can be done to fix that?