German training certificates are not automatically recognised in Arab countries, as each country has its own regulations governing the recognition of foreign professional qualifications. For this reason, the outcome may vary from country to country. According to information provided by the Federal Foreign Office in Berlin on its website, you should contact the embassy of the relevant country in Germany and request the necessary information directly from them.
If you do not receive the information you need there, the responsible employee will usually refer you to the appropriate authority that can help you and provide the right answer. In the case of the United Arab Emirates, for example, you can also contact the German-Emirati Chamber of Industry and Commerce:
https://vae.ahk.de/de
Further information:
Federal Foreign Office—Recognition of professional qualifications
tun25082001
tun25111109
tun25121001

