Maithili is a language spoken in India and Nepal by some 24.797.582 people. It is an official language in the Indian state of Bihar and it may be used in education.
A request was made for a Wikipedia for Maithili, it conforms to the requirements so that is not a problem. What IS a problem is that Mithilakshar, the script used to write the Maithili language, is not yet part of Unicode. The script has not even been recognised in the ISO-15924 yet.
This is the second request for a Wikipedia where the script that is used to write a language presents a problem. For modern Maithili there is the option to write in the Devangari script.