Google Is Dropping Support for Data-Vocabulary Schema

Structured data schemas such as schema.org and data-vocabulary.org are used to define shared meaningful structures for markup-based applications on the Web. As of April 6, 2020, data-vocabulary.org markup will no longer be eligible for Google rich result features. Search Console has started issuing warnings for pages using the data-vocabulary.org schema so that you can prepare for the sunset in time.

I have received a few of these for some of my sites for the breadcrumb schema, so check you Search Console messages to see if you sites/client’s sites are impacted. Your markup with schema.org should be just fine and you can use structured data formats like JSON-LD, RDFa or Microdata to mark it up. (but I think Goole has previously said that JSON-LD is the preferred format). For things data-vocabulary.org you can get those converted into schema.org and Google should pick those up.