Don't ever let a loan originator or loan officer convince you that "shopping around" will negatively affect your credit scores.
This is typically a scare tactic that some loan originators use to retain your business - possibly from finding a lower interest rate or better program elsewhere. Or, this could mean that this loan originator is unknowledgeable that the law had changed and just didn't know.
The fact is you "should" shop around! This is your right as a consumer and is covered by the FACT Act, which is regulated by the Federal Trade Commission.
Here is how it works: Mortgage credit inquiries within a 14 day window only count as "1" inquiry. And... credit inquiries only account for 10% of your total credit score.
So what does this mean? You can effectively shop with multiple lenders with little affect on your credit scores. So be wary of a loan originator or loan officer who tells you this. Let that be a BIG red flag!