Phone duplicates in Schema.org - is it possible?

Question

Search Engine Optimization

Good evening!
Connoisseurs, please enlighten:
The site has a header and footer, in which phone and mail numbers are duplicated.
When adding schema markup - should I add it to all phones, or will creating "duplicates" have a bad effect on seo?

Answer 1

Ivan, duplicates will not affect seo in any way, but duplicating markup does not make sense either. Label it in the header.