The Republic of China (ROC) on Taiwan has no official diplomatic allies in the EU. With the exception of the Vatican, it has no official allies in Europe at all. This does not prevent the ROC — Taiwan — from having close relations with EU member states and other European countries.
The exact nature of the relationship does bear revisiting, if only to clarify what is a very complicated and sensitive idea, the details of which leave considerable room for misunderstanding, misrepresentation and disagreement.
Only this week, President Tsai Ing-wen (蔡英文) received members of the European Parliament’s Delegation for Relations with the People’s Republic of China (note the reference to the PRC, not the ROC on Taiwan), led by Reinhard Butikofer, while the Ministry of Foreign Affairs received members of the Romanian-Taiwan Parliamentary Friendship Group.