You can check every registered EAC document status on-line following the links below.
(Note: This is Russian national federal register so it doesn't contain the documents issued or organization accredited by Belarus, Kazakhstan, Armenia and Kyrgyzstan)

Accredited organization status

https://pub.fsa.gov.ru/ral

EAC CoC (certificate) status

https://pub.fsa.gov.ru/rss/certificate

EAC DoC and GOST R (Unified) DoC (declaration) status

https://pub.fsa.gov.ru/rds/declaration