In phpBB 3.2 the BBCode engine was totally change due in part to the "old" one not being compatible with PHP7. Many phpBB 3.1 custom BBCodes will not work with the new engine without some modification.
There are many topics on this board about the problems with BBCodes so I would suggest that you do a bit of searching to see if your specific problem has already been answered and if not post you specific problem together with all relevant code.
Remember: You only know what you know and - you don't know what you don't know!
My CDB Contributions | How to install an extension
I will not be accepting translations for any of my extensions in Github - please post any translations in the appropriate topic.
No support requests via PM or email as they will be ignored