I have said Jumuah Mubaraka to someone and he said don't say that as sahaba did not do that. This got me thinking..
Can someone clarify with me, is it forbidden to say Jumuah Mubaraka?
As mentioned in this fatwa from IslamWeb, it is not known that the quote "Jomua Mobaraka" was ever said by the Prophet (PBUH) nor by any of his sahabah, so it is a new thing to Islam.
The Prophet (PBUH) is reported to have said that he who creates a thing not in our religion then it is refused, such as in this hadith from Sunan Ibn Majah:
حَدَّثَنَا أَبُو مَرْوَانَ، مُحَمَّدُ بْنُ عُثْمَانَ الْعُثْمَانِيُّ حَدَّثَنَا إِبْرَاهِيمُ بْنُ سَعْدِ بْنِ إِبْرَاهِيمَ بْنِ عَبْدِ الرَّحْمَنِ بْنِ عَوْفٍ، عَنْ أَبِيهِ، عَنِ الْقَاسِمِ بْنِ مُحَمَّدٍ، عَنْ عَائِشَةَ، أَنَّ رَسُولَ اللَّهِ ـ صلى الله عليه وسلم ـ قَالَ " مَنْ أَحْدَثَ فِي أَمْرِنَا هَذَا مَا لَيْسَ مِنْهُ فَهُوَ رَدٌّ " .
But if your intention was a du'a, it is ok to be said occasionally, just don't make it a habit. Otherwise, it runs the risk of being seen as a sunnah among many people, which is not of our religion.