Received an email this morning from support@braintap.com, stating that my apple id will be disabled because of violated policies. Is this valid?

No. Its a scam. Ignore it. Apple will never email you when your Apple ID is disabled.

You will find out the next time you try to log in anywhere that uses it, or try to do something that requires your Apple ID. But never by email. And Apple only uses email addresses that end in apple.com for official email notices to you. braintap.com is not Apple.

See here: Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support