I agree with rlcarey. Call the customers and advise them of the changes. They should have received a letter from their insurer, but some, if not most, customers probably did not read it or understand the ramifications completely.
Keep in mind that change endorsements have a 30-day waiting period, so you want your customers to initiate this asap.
45 day letters on June 1.
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Views and opinions are solely mine, are not meant to represent my employer in any way and should not be used as legal advice.