Click ID (fbc) - Increase Coverage Error

Google Tag Manager Server Container
1

I am getting Click ID (fbc) - Increase coverage (Coverage is 4% of the events only) error under event match quality score.

Currently, my score is around 4.3. If I move to a custom domain will this increase my fbc score?

I am sending Email, IP Address, User Agent, Browser ID, Zip Code, City and Click ID at the moment, however, my overall score is 4.3.

2
  1. fbc is a facebook click id, so it directly depends on % of traffic you have from Facebook Ads
  2. custom subdomain is something you should absolutely do regardless of this question, and yes it might increase the amount of fbc passed a little bit