France being a part of the Hague Convention works in favor of people wishing to get their French-issued documents attested for the UAE, as it makes the process relatively simple. Everything from school certificates to training certificates, marriage certificates , and a long list of others, requires attestation to be rendered valid for use in the United Arab emirates.
Requirements to Attestation of French-issued Personal Documents
Legal translation done from France (if needed)
Notary seal from France
Apostille or Ministry of Foreign Affairs attestation from home country
Consulate or Embassy attestation from France
Requirements to Attestation of French-issued Personal Documents
The general reason applies here as well: with certificate attestation, the certificate which is issued from france can be accepted as valid, because this is proof that it has been endorsed by an official body. There are other reasons as well for the UAE requiring document attestation.
Embassies require it in the issuance of passports.
Some entities and organizations, such as World Education Services, for instance, may require certfificate attestation
The Ministry of Education might require them for the sake of equivalency