P2 TinyMCE with Mention Support

I have a version of P2 running on WP latest. I’ve integrated TinyMCE into the primary post box. Doing so I lost the mention helper that displays user names as you type “@…”

If someone could help me re-integrate the mention help with TinyMCE I would be grateful!

Thanks in advance!

https://www.ads-software.com/extend/themes/p2/