Can't Share Google Map With Customers
I have a Google map on my business website which shows all of the locations where my products can be found. In the past, I have had no issues sharing the map as Public. However, suddenly the permissions on the map changed and I have had many customers requesting to share the map with them.
Re: Can't Share Google Map With Customers
any MyMaps related question should discussed in the GMaps help forum.
Note: GoogleMyBusiness (which is the only product we try helping here about) doesn't even know your GMaps or MyMaps account.
Therefore GoogleMyBusiness did not change any sharing settings of your MyMaps.
Helmut Geissler, Google My Business Top Contributor | my G+ profile