My daughter is 18 and on her birth certificate, the father's name is not mentioned and was not acknowledge by her biological father since birth. We don't have any contact anymore ever since. So she has no middle name.
I got married 3 years ago but not to her biological father.
What can I do just so UAE embassy will authenticate the birth certificate?

Czar Con,

We welcome you to this beautiful site, first!

Avoid asking repeatedly. This is against the policy of the site, as it leads to unnecessary load. If you want to draw the attention of the posters/members towards the question, you put in, long back (even as it was only 18th October, when you put it last) as -

https://www.askmehelpdesk.com/family-law/fathers-name-not-listed-daughers-birth-certificate-604850.html

You could write 'Please reply someone' in the second post, under same title, where you asked question, on same page, the link of which is inserted here. I hope someone will be able to answer your question.

Good luck!