Cannot use spaces in custom attributes #586

We have been using custom attributes for almost 7 years via the Javascript API without issue. We have a custom attribute with the key Company Name, note the case and space.

In our javascript code we simply do this:

'Company Name': "#{current_professional.company_name}",

and have no problems, however, when we try to use this gem and do this:

 contact = $intercom.contacts.create(
      email: self.account.email,
      name: self.full_name,
      phone: self.phone,
      role: 'lead',
      custom_attributes: {
        'Company Name' => self.company_name
      }
    )

The Company Name attribute in custom attributes, it does not record the data for Company Name (its blank, everything else is fine). Every example provided shows a key in lower case with underscores, but there is no documentation that says this is required and it works perfectly fine with the javascript code.

What are we missing?