Xfinity Mobile Customer Support Chat.

Hi, I would like to know if it's common practice for Xfinity Mobile Chat representatives to send authentication requests via texts stating "A transaction has been initiated on your account by an Xfinity agent. To proceed with this transaction, please verify by clicking here: [Removed Link]" at the very beginning of the chat(s). 

It's suspicious that a text would be asking me to approve a transaction as a form of identity authentication, opposed to a simple 2FA code, last 4 digits of the SSN, etc.  I did not approve this, and they would not answer basic questions without me approving it (which did not involve a transaction anyway). This is highly unprofessional, and it was a terrible experience. This happened twice within an hour. 

If this is standard-practice, as a multi-billion dollar corporation, why not send a text saying "approve this link to verify your identity", versus "approve this transaction" despite there not being a transaction to speak of?