Cannot sign up for Search Ads - Error message "Please correct the errors below before you proceed."

I've been experiencing this ongoing problem since I first tried to sign up two weeks ago for Search Ads via the online form at https://app.searchads.apple.com/cm/basic/app/signup (Basic) or https://app.searchads.apple.com/cm/app/signup (Advanced).

I fill out the form and hit submit and it gives me the following error message "Please correct the errors below before you proceed."

There are no form errors I can identify. I've tried multiple devices and browsers but get the same message.

I've reached out to Apple Support helpline and developer support email but so far no one has been able to help me.

If it's a problem with the online form itself, I would think the .com team would be the best contact but no one at Apple has been able to track down any contact info.

Has anyone else experienced this issue?

Thanks in advance.