ACS- Toll-free number application has been rejected for the following reason: 550 - Opt-in - No opt-in provided

Question

Hi Team,

We have submitted the Toll-free application and it was rejected with the below message. We will sending the SMS to our own employees around 1000 peoples in total to notify their shift change. Please help us to understand how we can submit the opt-in confirmation from the employees and if it required to submit opt-in of all the 1000 peoples in order get the application verified.

Kindly check and share your advise on priority.

"Upon review of your Toll-free Verification application by the Toll-free Messaging Aggregator, your application has been rejected for the following reason: 550 - Opt-in - No opt-in provided Please re-submit your application with a valid URL that shows proof of consent being collected. This needs to be a screenshot or mock-up of the UI where customer provides consent to receiving messages from your company"

Thank you!!