DialogFlow Regex Entity not being captured in Training Phrase

Question

I'm trying to make a DialogFlow bot which returns the height weight of a person, given the policy number. Policy Number is an alphanumeric string on 10 characters with "AA" (2 A's) in the start and then 8 random digits.

I've made a regex entity for the same.

^(?i)a{2}\d{8}$

But in the training phrase whenever I type a policy number it is not being mapped to the policyNumber entity. I'm fairly new to DialogFlow and this is the first time I'm making a bot.

So, can anybody guide me with what I'm doing wrong.

Here are some of the screenshots.

Training Phrases:

Here are some of the warnings:

policyNumber Regex Entity:

Answer 1

The problem was solved after adding 10 training phrases and manually mapping the "regex entity".