MDS Database Errors

Hi,

All of our MDS generated logins, users and roles mentioned in the link below appear to have no access rights.  It's causing errors for creation and editing of any models, entities and attributes.

https://docs.microsoft.com/en-us/sql/master-data-services/database-logins-users-and-roles-master-data-services?view=sql-server-2016#master-data-services-database-role

We think this may have come for SQL server updates but are unsure.  Anyone had similar issues or know of a resolution path?

Thanks.