Did you ask Support?
If you click on the # there, does it say more about it?
If you check the fields in question, is the string too long for GTW?
I have not reached out to Support yet but will if I can't find a solution here.
The # doesn't give any more info.
I can't imagine the string being too long for GTW. I have people who first entered our database through the webinar form so are only asked Name, email, and company and have standard values in there (such as Mark Eto, Marketo, email@example.com) that have that same error.
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Posting a quick update:
I looked through the different error codes that cause registration error in our instance and can't find a single root cause. We get quite a few for our larger webinars and the field team is tired of continually manually changing these people. So, I've decided to just add a flow step as part of each program to automatically switch people from Registration Error to Registered.
Been doing this for a couple weeks so far and haven't found an issue yet.
I had the same issue yesterday, and the same Error message as you have provided in the screenshot. I asked Marketo support and they have been very helpful. In my case, the form fields First Name and Last Name were progressive profiling, and I changed they to always be visible. GTW needs all three in order to get the registered status. Please check that.