@Prav , @Jimmy Woolley , @sébastien seb We haven't received any further information on this. I am assuming you are trying to create python/java functions on Free SKU. In that case, it could be a restriction as these stacks work on 64 bit workers and free sku doesn't support 64 bit workers. So we end up blocking function apps on Free sku since the language could be changed later.
Our team is also working on certain improvements regarding this.
Please let me know if this is the scenario for you and whether this answer helped. If yes, please do not forget to "accept the answer" and "up-vote" so that it could help others.