Yes same problem here! Worked fine in December and before that for the last 20 years (or longer). Now the customer merge simply never opens Word with the completed document. No error or anything. Same for all templates, even the ones that came with QB. Tried creating a new template. Tried the QB Tool. Tried repairing both QB and Microsoft 365. Tried Office all the way back to Office 2007. Reinstalled the current MS 365. Tried on other computers I have. Changed all the trust center, addin, macro, network permission and content settings in word I could find. I can edit templates and the fields populate but the DDE exchange never merges through. Nothing. Pretty disasterous because I need this function every month!!! I have self signed VBA projects that pipe Outlook data to Word and that works just fine. I'm going to have to hire a monk to transcribe documents. QB communicates with Excel fine.

<edit> Also tried with QB2019 that has a build from 3/2022, QB2019 with the current build and QB2022 current build. All on Windows 11.