Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
No Application installed 32-bit, my account associated with Office 2016 pro plus which was automatically installed 32-bit everytime so I uninstalled this & install Office 365 64-bit but after installed it shows automatically 32-bit
Another possible reason is, you have some 32 bit Office application or component installed.
Press Windows key + R
Type: appwiz.cpl
Hit Enter
Scroll through the list and look for all 32 bit products for Office, whether new or old versions and make sure they are all uninstalled.